There are 100's of tricks and tips available on the roll20 forums. Planescape I have read thoroughly, but not really ran any settings in the astral plane...per say.. Kinda hit the fringes on it with Gith's and MF's and the like...in my regular campaign. but with some of the innate, spell, psionic abilities of this setting... You will defiantly need to check out the forums for them...a must.. And pick a good character sheet for your game.. I would suggest the AD&D 2E Advanced Character Sheet. . Has a good layout for Psionics, Spells, and such. Enjoy Roll20... You will like it as you get involved with it's abilities... If they would only fix the DL stuff. ...