Advice for a workstation

[quackers03]

Budget (including currency): (Planning to save) UK pounds

Country: UK

Games, programs or workloads that it will be used for: AutoCAD, Hydraulics/pneumatics programming, potential gaming like war thunder/star citizen 

Other details (existing parts lists, whether any peripherals are needed, what you're upgrading from, when you're going to buy, what resolution and refresh rate you want to play at, etc): 

 

Hey! So I don't really know much about desktop PC's other than bits and pieces I have picked up from watching Linus, and I was hoping at some point to try build/buy a pre-build PC that could accommodate software's such as AutoCAD and a couple other programmes/ software's that aren't really of the highest spec. I am an degree level engineering student and do not fully know what types of software we will be using in the future and was hoping to get some guidance or suggestions on what I should roughly be working towards for a PC that will hopefully last quite awhile. I would hope I could also get away with playing war thunder or star citizen on it as well (if not it's okay). 

I'm just not really sure where to start (pre-build/ build it myself)

Thankyou :)