e926 is sfw in the sense that it has all the art from e621 that doesn't have visible bits or gore. Expect a lot of extremely suggestive or outright fetishy stuff though.
The dice determine success or failure, but your strategy can have different outcomes. If you're offering a bribe to the guard the DM has to figure out how much it costs you, wheras if you're telling him a dragon is attacking the south gate, he might be pretty pissed when he comes back.
And if you don't have "charisma" irl and have no idea either of the above are options...think about charismatic characters in books, movies, tv. What tactics did they use that you can crib?
"I liked rage against the machine before they got all political"