Ok I've just seen a bike I really really want

but don't have the first clue on what to do on ebay

I've put it on my check list to keep an eye on it but thats all.
So as I'am soooo new at buying from ebay could you guys give me some tips please
Now I know I can get a 100 point bike check plus I think it's called a status check

if thats what it is called that lets me see if it's been crashed, finance on it etc.
Please fire away and state the obvious