Hey there. Yeah it seems easy to learn and hard to master 😉 . Actually I didn't write on how to start. But it sounds like a cool topic for newcomers. I'll give it a thought.
Actually it's hard to say what is a good card and what isn't. It depends on many factors such as ruleset, manapool and opponent. I'd recommend to start with extending your collection. Add a few cards from time to time and focus on CL and RW and I think you should do well in a few days.

Hope I could help