Hi, I am new here and have Newbie questions?

I set my T9 to mine in kano pool, but many questions poping up my head

1. to set my wallet address, the kano pool web site ask me for password, what password it should be? i don't remember to set password for my wallet address.

2. what is the minimum amount of BTC to get payment?

3. how i can see the amount of BTC produced/mined, in other words where i can see my miner progress?

4. It is normal that my worker higher invalid % than block %? checking on detail shows many stales?

thanks, i would appreciate any reply with answers