Just some quick answers cause I don't have the time to answer them all.

2. Scouts
Don't waste tokens on scouts. You have only 20 tokens so use them wisely. It is best to find an older player with good stats and go for that one untill you saved up some more tokens for young faster trainers.

3. Free agents
Since the update there are hardly any free agents anymore. And if there are free agents then they are older player with little value.

7. Power train
The quality 14 player worth 1 million is a fast trainer for sure. However you can sell that player for 1 million and buy 3 older players of 300k-400k each. Way better to have 3 older players of 29 quality then one fast trainer of 14 quality. The lower quality players with high prices is your best way of making money right now. If these high price players are like quality 22-24 and they are performing well, then keep them.