Hello, new player here, Can anyone recommend a good beginner guide?

Welcome!

Here's a link to a different part of this same website:
https://forums.galaxy-of-heroes.starwars.ea.com/categories/the-academy

That's the subdivision for newer players asking questions and getting help getting started.

There's tons of great stuff in there many of your questions might already be answered. Why don't you poke around there for a bit, and if you still have questions, ask again and I'll be happy to help -- or if I'm not around, lots of other people will, I am sure, chime in with suggestions and answers.