if you know absolutely nothing when it comes to computers, and reading up on it is akin to asking you to go back to school and do ten assignments... then get a "branded" PC. if not, a DIY one will be awesome.
a "branded" computer offers you support services for up to x duration, during which if the proverbial sh*t really does hit the fan, you don't have to lug the whole system down to some shop whilst you're being squeezed by bargain hunters looking to find that awesome graphic card that will make their gaming experience 2% more lifelike. the trade off for this however, is the initial outlay that you will be making, plus the inability to be upgrading your parts at a later time frame without being held for ransom by the "brand". that being said, you could always feign ignorance due to you not knowing what is out there on the market, owing to you knowing absolutely nothing for computers!
and while DIY parts tend to have their warranties as well, I'm pretty certain that you would need to ship them out to different parts of the world to get them serviced/fixed/replaced. that wouldn't be much of a concern to you since the probability of a part break down is <0.05 but as with life, one can never be too sure.
do weigh up the pros and cons, and if you're not sure, just yell out for some help. I'm sure there will be people who will be more than willing to help you. (= I'll be doing that soon at the end of the year, to replace the one I've got back in Singapore due to a lightning strike shorting everything (either that or a gecko thought it would be warmer in my computer and shorted the damn thing).