XPredator

No, just always have 15% of it empty

no need just leave it all in 1 big pot. just don't fill it up past 85-90% full

Okay, I will try haha.

I'm assuming you will be using Windows? If so then the install will be pretty straight forward. It will tell you what to do as you go through it. 
(make sure you have a license key to activate it when it asks - you can use it without one, but some features will be locked/unavailable).

As for drivers - one you have your part list finalised - on a diifferent computer,  go to the website for each part and there should be a support section. There you will find a download list of drivers for your part. The only exception being the graphics ad you will either have to go to the AMD site or the Nvidia site (as they are general sites and you will have to find your specific graphics card - it doesn't matter on the brand of the card, just the actual GPU).
Put all those drivers on a USB Stick and when the OS has installed (assuming you are using Windows) - plug that USB stick in to the system and install the drivers one by one. Doing it this way will ensure you have the latest drivers and you might not have an internet connection as there may not be a driver for the LAN port/WiFi on the board. 
 
EDIT:
Typical drivers you will need:
Chipset/PCH
Audio
LAN/WiFi
Storage (maybe)
USB (3.0/3.1) drivers
Graphics Drivers
 
The reason I recommended the TomoHawk is if you have the MAX version, then it should support the Ryzen 3rd gen with no issues out of the box. If not then you can easily update the BIOS (needed to make the system boot). The instructions for that will be in the motherboard manual.  
 
When installing the drivers, follow the instructions on screen and do them one at a time. The system may need to be rebooted after the drivers are installed. it's best practice to do so.

After the operating system and drivers are installed, I use https://ninite.com/ to create a installer for all the most common programs I use (such as web-browsers, email client, media players etc.) You don't have to, but it makes getting the programs so much easier as its all in one installer then.

Hope this helps a little. 
 

Sorry, not so. OpenGL (I put CL in my previous answers, my mistake). It a rendering platform for 2D and 3D graphics (mainly games, can be used for CAD and visualization). It is not a benchmarking platform. It is a Graphics API, the same as DirectX (just an open standard - unlike DirectX)

EDIT: I should correct myself - Nvidia does support OpenGL - however, in the past it has been evident that AMD cards seem to perform better than Nvidia when OpenGL is concerned.)

CUDA, I refer back to my other post 
 

Don't worry about being a noob - we were all there at one point haha.

They are different technologies mainly used in development and research. CUDA is Nvidia propriety and can be used for more than just games, it can be used to accelerate general computing usage. Nvidia have an article here: https://blogs.nvidia.com/blog/2012/09/10/what-is-cuda-2/
If you don't know what it is, you probably won't need it.
The same for OpenCL execpt that it is an open standard that anyone can adopt.

In a day to day life, you might never encounter them. I just listed them as each manufacturer (AMD and Nvidia) have their own little quirks and features that the other does not.

What is your budget and how much each of the lists cost? 
EDIT - Did not see the budget is 900-1000 USD (I work in £ so this is going to be skewed a little due to my countries maditory 20% VAT on pretty much everything...)

Breaking it down:

Case is subjective. Get one which you like as long as it will fit your needs.
RAM - you're pretty much set on the 3600MHz, great speed for Ryzen so that's fine on all the builds. The aesthetics are again subjective. Go with what ever is cheapest but has decent timings.
Processor, I'd recommend the 3600 as the 3600 will be the best out of them all for general multi-tasking due to the 6C/12T (the 3500 is just 6C/6T with less cache than the 3600 IIRC, and the 3300X is 4C/8T). If you're just gaming the 3300X should be just fine, need a little more - step up to the 3600.
Motherboard - All good options listed. Personally I'd go with the MSI Tomohawk as I've heard good things about them such as the power delivery, the bios flashing - it's generally a really good board for Ryzen.
PSU - don't go cheap, a decent 80+ Bronze might be enough for your needs (although the 80+ Gold is a nice to have, its not essential).
Storage - You've listed SSDs, which is great - but do you have any extra storage? If not, get the biggest SSD you can get while being in budget.
Monitors - again, subjective - Get what you prefer (I'd go either 1080p 144Hz at 24" as the pixel density at 27" is not great or 1440p at 27" if you need the bigger screen - again, your choice.)
GPU - Not too sure about the 5600XT vs 1660 Super. You'd have to look at performance charts and see which one is better for you. Do you use OpenCL - then the 5600XT card should be better. CUDA? Then you basically have to go with the 1660 Super.



Out of the parts you have listed - I'd go:
CPU: Ryzen 3600 (For general use) / Ryzen 3300X (If I'm just gaming)
RAM: Any of the 16GB 3600MHz kits (as long as the timings are decent)
Motherboard: The MSI Tomohawk
GPU: The Nvidia 1660 Super (I find Nvidia drivers to be more stable)
Storage: A decent SSD (256-512GB, hopefully NVME) and maybe a 1TB HDD for mass storage (could be external).
PSU: The Coolermaster one should be sufficient - even though its only 80+ Bronze
Case: Any that fits my budget and has space for all my needs
Monitor: 1080p 144hz if its 24", if 27" then the 1440p monitor.

Hope This helps a little. 

PS - here's a list I just threw together on the US PCPartPicker site, total comes to around 826 USD, without the monitor: https://pcpartpicker.com/list/wc2Pp8 

I would have suggested PC Part Picker, but they only have India & Singapore pricing details.