So if you are relatively new to this whole old school thing (like me) but want in on that flail snailing goodness, here's how I do it:
1) roll 3d6 seven times (STR CON DEX INT WIS CHA & GP). If you want to live life in easy mode roll you can assign them how you like, otherwise swap two.
2) Pick your class. The basics in Labyrinth Lord or Jeff's Random Classes or the big ol FRACAS put together by Daniel Dean. If you want to get fancy you can use one of Skerples’ Races (there are some fun ones).
3) Roll for spells of you're a caster and buy some equipment (again, Labyrinth Lord or BECMI or whatever) and make sure you have the dungeon crawling basics. That 3d6 for gold gets timesed by ten so you got some spending money.
4) If you're making this for a particular game, keeping in touch with your other players so you're on the same page (i.e. not having all MUs etc).
5) Have fun~~~