10 Rules for Beginner Mapmakers

Hey guys, I wanted to get your opinion. I recently decided to create my own campaign for Heroes 3. I can't upload everything, so here's the first map. I've already made 10 parts, all with a good plot and balance. The maps are mostly not very large, but it takes time to complete some of them. Take a look and give me your feedback; if you see any mistakes, let me know, and I'll fix them.