go to
https://dpostools.com/LISK/ and enter your Lisk amount there.
Then you can see how much you can earn with each delegate monthly.
Voting is required only one single time. The higher the share rate of a delegate, the higher your earnings are. Unfortunally most of the 101 delegates only share ridicolous 5-25%, so you shold prefer especially the few remaining independent pools which share 40%+.
Actually, I'm not so sure either about this calculator, or the delegates, because I'm not getting an amount even close to what I should be getting. Actually liskelite and robinhood are the only ones that paid me anything significant. I could easily unvote the rest of delegates, especially gdt pool, which voting for is pointless. You need to pay 1 lisk every month because they change their delegates that often, but in such month, even if you have a medium size wallet, you won't get your 1 lisk back.
What I don't understand is, if robinhood and their pool can pay that much that frequently and somehow they still find it profitable for them, why can't every delegate do this? I mean, I don't think robinhood complains about their personal profits and I for sure don't complain about what I get from voting for them. So it's a win-win situation. So where are other robinhood-like delegates?