If you can get someone to show you it will save a lot of time if you have never seen coffee roasted before.
were are you located?
What do you intend to roast in? A popper is a good choice to start with. I did it that way as there is heaps on the net about it. It really is simple. There is no need to mod the popper, though if you eventually want to, then again, there is plenty out there on doing just that. If you do a search on youtube, I put a couple of videos on it quite a while ago of what 1st and 2nd crack sound like when roasting in a popper. You may find them useful. You can only do small quantities of course, but when you're starting, that's probably a good thing. Have a look under the Roaster thread, there's a sticky dedicated to roasting with a popper.
One bean that I really like is Honduras Montana de Comayagua which is in Bean Bay. I roast it in a Behmor and find it easy to roast and tastes great. Though I don't brew them cold pressed.