Alright FireZ, I'll start it off.
Where you can buy the game is in almost any game store such as EBGames, GameStop, and et cetera, you would have thought that they would stop selling the game after maybe 10 or so years, but no, it's still selling and at a pretty high price, we're talking about $40ish, but Amazon.Com sells it for $18. There are some people on Sythe that sell CD-Keys that will save you money, so you don't have to go out and buy a new copy. But having a legit CD-Key is really important to play on Battle.Net, since Closed Battle.Net is filled with hacked items and characters. Battle.Net is where 90% of all the fun is.
Links to buy the game:
Choose a Sorceress class, because that's best for new comers to start with, since you can do Magic finding with that, I suggest a Fire type, since that's one of the strongest, I'm talking about 14K damage with the right gear. The best way to level in my opinion is to get to level 25, then get a friend to rush you to Baal, then start doing Baal runs to level 50. After Baal, you'll be in Nightmare level, then go get your friend to rush you again, then you'll get to baal, then do Nightmare Baal runs until you're level 75, then defeat Baal and go to Hell level. In hell level, get your friend to once again rush you, then get to baal and do baal runs from there, and it doesn't matter if you defeat Baal or not, there's no other levels so you'll be in Hell level. Also, in my opinion, the best way for your friend to rush you is with a Hammerdin Paladin.
Here's a video for character build: http://www.youtube.com/watch?v=PuRLAuLuj9A
When you start to do Magic Find, do it on Mephesto, that's the easiest and fastest way to Magic Find, since you don't need to do much to get to Mephesto. Also, I forgot how to spell Mephesto, so if anyone can correct me, feel free. When you start doing Magic Find runs, you should have your best strongest weapon and shield out to kill Mephesto, then when Mephesto is about to die, you press "W" to bring out your Magic Finding Weapon and Shield to get a high chance of finding something good.
That's about all I remember, since I haven't played in the longest time. I hope that helped some of you out.