Hi, I'm new to aquatic pets. I have a few 4ft and 3ft tanks left by my friend and I'm thinking of keeping fishes. I've read some tips online and would like to get some advice about where I should start.

1. Should I get a filter and pump?
2. What would be the best fish species for beginner? Easy to be taken care of and less demanding on the environmental factors
3. Any recommended aquatic pet shop?
4. Internet says that I should not locate the fish tanks outdoor under direct sunlight. What would be the solution if I have no choice?
5. Any tips for a beginner?

Thanks