Hi there, I haven't been here too long myself, but I think I can help you get started because of comments that were given to me. :-)
Please name your continents so that we're all talking about the same thing. It's easier to comment on specific map areas that way.
How to get your rivers in the right place is helpful info on realistic rivers.
Map for a world building project is a thread with info on oceanic currents, wind direction, rainfall patterns and more.
My world building project needs realism is my thread where you can see the evolution of my realistic world so far.
I hope this can help you get started. :-)