All good questions!
We don't (yet) have #Nostr sign in capabilities, so you can only link to a wallet outside the Nostr ecosystem in your Rigly account (like Sparrow, for example).
Mining rewards will go to your pool accounts (like Braiins, for example).
You can choose any mining pool you like, we hook up to all of them. You want to hook up to a pool so you can access your mining rewards.
Instant mining is...instant 😉 it's our short-term, get your feet wet, learn how it works feature. (super cheap way to try it out).
Fixed return mining is long-term. It's brand new and starts at 30-day runs, soon to be longer. (More expensive, but you stand to earn some sats back so you can mine and not lose money).
There's also our #BlockParty, which you win your way into with auctions, then we mine as a pool to try and hit a block as a team. Like a lotto with friends. 😃