Best way to go

Hi all!

Early 30s, fit, decently hung guy here. Even though I do ok size wise, I really want to make it bigger. Working on my muscles and physique, and want to increase this size as well.

Any tips for first starting out? I have a pump I have used a pump before but never "seriously", and really want to get into it now. Ideally length is my focus. Any issues starting at this age?