After training it is a good idea to join a corp. But upgrade your cargo modules and engines to be able to do SOS missions. With time you will be able to have more SOS ships. If you do mining, do not do it at SOL, there are pirates. To do mining you need to defend your mining modules.
Good Luck and have fun.
I'm new too and I'll introduce myself soon...
but I just wanted to say I think that's good advice about the cargo and engines, I'll start working on that on my end, so thanks for sharing tips and advice with us
if you can find me in-game send me a friend/buddy request, I'll do the same if I'll find you first...