Hey Ben! Welcome!
Just be careful to bite off more than you can chew. Personal Development is a long road, but an awesome one, you just have to be careful not trying to eat the whole cake in one mouthful.
For a first 30 day challenge I'd suggest 3 at most, one major, one medium and one minor challenge.
And frame them positively, give yourself lots of reminders, and write down the benefits you hope yo accomplish.
