1) Should I spend all the greens on training Dahl and Nzala?
Dahl wants about 60 greens to be a 6* player and Nzala about 40-45 for teh extra position and 60 to be also a 6*.
if you can find 15 greens per day, go for that.
if not, you can find a high 5* GK instead.

Should I buy nothing until the end of the season except the young AML?
You should be in the market as more you can and if find the chance to buy those players I wrote above, with few tokens , grab them.

3) I don't understand how I can ask for a loan to the bank.
If you 're out of money, you tab the "money" button and exchange your tokens for a money pack.