Go to seed sellers and look at reviews and genetics. Find strains that have good strong genetics and were said to be easy to grow. However I would not shell out 40-100 bucks on my first grow to only find that my inexperience led to them dying or not achieving full potential. If I was you I wouldn't invest in a mix bag. They are cheap and you could be getting top dollar strains. Good companies for mix bags are Dutch Passion and TGA seeds.

Happy Toking :rasta: