as always, www.erowid.com is helpful as can be

but heres a few answers

a normal dose (usually 1 hit) will be from $3-15

with pure acid, (not watered down) i would suggest 2 hits to get the best effects - its not INSANE, just a feel of what it can do.

forms of acid - liquid, pill, square piece of paper, sugar cube, dropped on a pill. - lots of different ways, but i suggest watching the dealer drop the acid so you know hes not giving you too high or low of a dose

duration - for me, 2 hits lasted around 8-9 hours, with somewhat of an after affect the next morning, - i suggest dosing at 5pm if you plan on sleeping

Additional notes: its hard as hell to sleep while on acid. so when you're coming down, its helpful to smoke a bowl .

Acid changes reality and perception, its hard to act normal - but you dont even want to act normal when you look up at the stars..