Hi Dave,
Yeah, don't be afraid to ask people here first before buying something. We were all newbies once as well, and we're all here for the same reason as you. So don't sweat it... I understand how "a good deal" may seem too good to pass up at times, but just make sure you really know what your'e getting, and who your'e buying it from. Fully understand the sellers reputaion before clicking "Buy it Now." Matter of fact... stay away from ebay all together! You'll thank me later.
Have fun!
Jess