can't really help you with any sites since i don't know any off the top of my head, but there shouldn't be much to it. the motherboard shoudl come with some type of installation booklet, which shows how to install the cpu, cards, hd, etc., and since you have messed around it shouldn't be a big problem. as for teh "cpu goo," it isn't required, but it is good to have. again, most heatsinks usually come with this, but if you want the better stuff you can go for some arctic silver 2, or even the arctic silver 3. unless you are really picky about temp. or plan to overclock, it shouldn't be a major issue.
as for recommendations, there was a site listed in one of the forums here:
yahoogle.com on some of the parts that were considered "hot" and where to get them. most of the stuff i would probably get the same, but hey everyone has their own opinion. maybe you can check it out to just get an idea of what is the going trend.
hmm, i guess i might as well give a quick description on how to add put it together too.....and anyone please add or correct me as needed:
1. mount the motherboard into the case
2. attache the power switch, reset button, etc wires to the motherboard (details in motherboard manual)
3. install the cpu, and the ram
4. apply a thin, even layer of heatsink compound to the heatsink, or pull off the tape cover, or wahtever it is in your case, then attach the heatsink. Check that it is attached properly and firmly (this is crucial)
5. install your drives and attache the cables accordingly. i.e., IDE0 to master, etc etc.
6. install your cards
7. make all necessary power connections
8. check to make sure you did everything correctly......and you should be done
oh yeah, make sure you take proper precautions like making sure that the power supply is not plugged in, and that you ground yourself etc., though i am sure those were *given*
well good luck, hope i was of some help?