What specificly are you nervous about, the kind of players you might get? If it's something like "not being that familiar with the GM tools/running games on Roll20", you can mention that in your initial posting. (But I see you have +1000h on Roll20 so I'd be hardpressed to call you "new to online gaming") If you prefer to only have player characters created without homebrew-rules, you can mention that the game you're running will have [Core Book + these limits in character creation]. Mention whether you have some campaign-setting related preferences related to what PC you'd allow in your game, you cam mention that. Other than that, I can't come up with more advise, unless you're more specific. The [Read First] Posting to LFG & Paid Games stickied thread in LFG does say under "General Guidelines" : Only create threads or listings for upcoming games on Roll20 And I've seen threads about questions related to LFG here before *shrugs*