i suggest to read the forums first man, start doing ALL tutorials and all your questions will be answered.
1. How much money will you make ?
All depends on your skills and marketing
2. Im not sure if i understand your question, but you can program AI without arrays
3. Animations have to be edited outside construct, there's enough tools to do so. Animations happen with frames, you can make a ragdoll though
4. Use variables and events for the gradually fading
5. What is RPGS ?
Free edition gives you 100 events and 4 layers as limit