Stregachess, i too am a beginner builder with no helpers to ask questions. But, i found something that will make up for that(at least for me). On youtube you can find videos explaining almost anything involving building the machine, from applying thermal paste to mountng the mobo, and probably the software stuff (although i havent seen any). the one youtube vid i saw with the mobo installed the mobo first and added everything else later. But it also said u could do the psu first then mobo, followed by pcu, etc...
hope this helps