How can u increase form
Player form is 9 at maximum

when you start the game, your teams form is low. But most important thing is form to win.
For incerease team's form, you should play lost of matches. You should arrange friendly from
Community-> Forum-> Football-> friendly/training
You can write a massage to find friendly or you send invite a friendly at this page to other teams.
Click a team, than click challenge icon-> select day-> click challenge

You can make two matches, when make a home match your team gains money. But offer double matches (Home&Away match) to your opponent, otherwise he possibly does not accept your offer.

How many matches should you keep form
A team must make 5 matches ( for example; 2 leagues and 3 friendlies match) in a week to keep form at 9. When teams form are low you should play much more friendly.

I need to rest zzz:)
you shouldn't play him for a one week between tuesday and monday. Than he would be okay