One of things I love about this job is that you never stop learning. I have been flying commercially a little over two years, and I really do learn something new every day. It's a cliché, but any flying qualification is a licence to learn, be it a PPL, CPL or type rating.
The learning curve is indeed very steep, but things will get easier with time and experience. If you pitch up with an attitude that says; "I know I'm inexperienced but I'm keen to learn – what can you show me?" then the vast majority of captains will respond very well. I'd also echo
Wirbelsturm's advice about never being afraid to question. 200hr FOs are just as capable of saving 20,000hr captains from embarrassment as the other way round.
P.S. Congratulations by the way!!