1. How often is the Importance score Recalculated?
Every 360 blocks
2. How many Txes can be included in a Regular Block?
3. When will my Balance be Vested?
Every 1440 blocks 10% of the Unvested Balance becomes Vested
4. How many Cosignatories can a Multisig account have?
5. How many Mosaics can be attached in one tx?
6. Can I Mine XEM using my computer?
No, XEM can't be Mined. XEM can be Harvested by activating Delegated Harvesting in your account, but you will need to have a 10,000+ XEM vested balance in your account to activate this feature.
7. How can I activate Deligated Harvesting for my Account?
Here's a step-by-step tutorial on how to setup your Deligated Harvesting: - https://docs.nem.io/en/nanowallet/delegated-harvesting