1, There are many terms depending upon the circumstances involving both the parties. Mostly parties agree on withdrawal of pending litigations and waiver of future alimony claim. Custody of child, if any, is also mentioned.
2.Yes, once you reach to a settlement, both of you move to high court for mutual quashing.
3. Even after MOU is signed wife can file case but not after mutual divorce on mutual terms and conditions.
The terms you have mentioned can be mentioned in MCD.