Hi Damowain,
Welcome to the forum. It sounds like you may need to pick up a couple of extra books. The Rotographic ones advertsed on this site, about grading and collecting will be very helpful.
eBay is just one place to buy from, but be careful you do not rush in and buy everything you see just because you want some coins. Have a think on what you fancy, ask some questions on here and take your time.
Go back through some of the old posts and you will start to see the names of dealers mentioned, also have a look at the coins for sale section and you will start to get a feel for things.
you do not have to spend big money to get a few nice coins and remember don't worry if you miss a coin for sale, like buses there will be another one along shortly
Ian