Just a word of warning LEDs are not current limiting. They will eat as much as they can, until the die. If you are really sure that they are rated for 12v and have current limiting resistors inside of them, then you are fine to go. The analog RGB LEDs inside of PCs that use 12v are wired with 3 LEDs in series, each color also has a resistor to limit the current. Not having a picture of link makes it hard to help.
It seems like you are a solution looking for a problem. The best way to get into something like this is to have an end goal in mind.
For me a few years ago I got into water cooling and RGB lighting. I wanted a way to unify my 12v Analog and 5v Digital RGB devices. I watched a lot of electronic engineering videos, read a lot on line, and asked many questions on reddit. No matter how complex something is, it can be broken down into little parts. I found an Integrated Circuit (IC) that could do 90% of what I was looking into. I started to research how to create a circuit with that IC to do everything I wanted. I started playing with bread boards, resistors, mosfets, and the IC. Then I watched videos on how to solder, got a decent iron, and soldered some really rough prototype boards. Then I watched more videos on how to design Printed Circuit Boards (PCBs). Then I ordered parts and ordered a few cheap prototype PCBs that I designed. Put it all together, learned some more from trial and error. I did about 3 to 4 prototypes, before I got a finish board: https://www.techpowerup.com/review/solarity-technology-rgb-dac-expander/
I then started to learn about logistics and I ordered a production run of 100 boards that were about 90% assembled. Then about 6 months later I ordered 400 boards 99% assembled.
Proof of Concept:
Prototype Phase 1:
Prototype Phase 2:
No Video, as I had a design flaw in my first PCB
Prototype Phase 3:
Prototype Phase 4:
PreProduction:
First Production Run:
I could go on, though no matter how stupid or insignificant an idea may be, if you are driven and want to get it done, you can get it done. Our biggest hurdle tends to be ourselves. The most important thing is have a goal, then try to break down this huge scary monster of a plan into little pieces that you can easily digest. I had no experience in EE, till I started this project.
Solarity got a reaction from Ben17 in PIn out for AIGO DR12 PRO PC fans
Solarity got a reaction from Epitome_Inc in 12v LED wiring info needed
Solarity got a reaction from Hackentosher in Getting into doing diy tech projects
