Full sim racing set up from scratch

[lawyered07]

I am completely clueless on this so starting from the very start...I basically want to end up with a half decent sim set up (doesn't need to be anything special) which is easily usable.

I went to mercedes-benz world and had a go on their simulators...im after something like a presumably much less powerful version of that.

Can anyone give some guidance on where I should be looking, what i need to be looking for and if its going to be realistic to do that for under £2.5k?