Hi, I just started this game since I heard a lot of good things about it, and i wanted to play a second gacha game alongside Fire Emblem Heroes.
My first pull was a SSR Teen Gohan (as a Gohan fan, this pleases me!) , is that good, or should I try to reroll for something else?
Also, any tips for newcomers outside of what I can find in the OP?
Welcome.
Whoever told you good things was lying, this is a fountain of salt and regret
I assume that SSR was from the starter pull, which always gives you an SSR out of that Gohan, a Goku and a Piccolo, so it doesn't matter.
The real metrics for re-rolling comes in your first multipulls. You should have a bunch of free dragon stones, so use them all on the Super Vegito Blue banner (or the Extreme Rose banner, but Super is more useful for beginners, in my opinion).
You can also farm a bunch of story quests for stones since you have 3x EXP and can play for a long time before stamina running out.
In your pulls, aim for at the very least Vegito Blue, he's the current top card. Ideally, you would reroll until you get something like Vegito Blue + one or two god leads (SSJ3 Gotenks and Super Vegito) or Gogeta. But there are a lot of good cards you can pull and you don't NEED the very best to enjoy the game, it's just that this is the best time to re-roll since so many are available to pull.
You can ask us about the characters you got and we'll tell you if they're worth keeping or re-rolling. But ultimately, until you get bored of re-rolling, keep trying to get Vegito Blue (you'll almost certainly end up with a few other SSRs along the way, maybe you'll get lucky there).
As for tips, a few pages back we had a couple other newcomers and there was a bunch of good advice in the thread, I suggest giving it a look. In any case, you can always ask here.