I have some questions for you pros out there

1. Is sticking to one formation a good thing?
2. Do players perform worse if i play them in alternate? Cause i have 2 players in each position. I often replace them after every match due to their conditions
3. I have a very tight fixtures, how do i manage my training? Or should i not train my players at all?
4. Why is my money getting deducted by a grand each day?
5. What to build first at my stadium ground?

Thanks