best thing to create a sorc first
sorc can equip all your other characters quite easily
create the sorc, have her rush thru norm and nm into hell, and start mfing (magic find)
do nm andy and meph to build up some wealth and tradeables
then move on to hell andy, meph, pindle runs
id stay away from diablo and baal runs because they take too long to mf, compared to the other 3 bosses which can be mfed in like 2-3 minutes tops
also offer to rush ppl thru nm and hell for their hellforge rune drop, easy way to aquire "wealth"
get maphack, it really helps mfing, rushing, and overall play in the game
u can easily lvl a character to 80 in two days
from like 1-12 do tristam runs
13-20 do act 2, or arcane sanctuary + tal rasha tombs
blow thru acts 3 and 4
have someone do the ancients for u at 20 or 25
and then from lvls 25-50 do normal baal runs
at low lvls like 25, u will just be sitting in, but u will be gaining mad xp, like a lvl per run
at lvl 50 get a rush thru nm and start doing nm baal runs asap
stay in nm til at least lvl 70, but i would suggest lvl 75 because u will still be getting xp from nm baal runs
at 75 go into hell
should be pretty quick and painless