The keybinds normally are Q to summon the stand, E to barrage, R to strong punch, F for Special Ability, G and/or P to pose, T for an ability (Often knife throw), Y for another ability (Healing, gun etc), C to roll, X to block, Z to Stand Jump and V for Dash (Sometimes not dash, it was the only ability I could think of).

If You're Having Trouble With A Stand You Can Look It Up On The Wiki, Some Stands Wont Have Pages But If They Do They Should Have Everything You Need!