The current staking rate (which will be in effect for 6-7 years I believe at present block rate) is 20% annual.  That is shared with the node holders, so the effective rate is 8% annual.  As far as a staking pool, I know StakeUnited used to support B3 (kB3), and I think there are others, but I know the Team is hesitant to endorse sending your coins somewhere you don't hold the private keys for an extended period.  Not saying any particular group is untrustworthy, but giving someone complete control over your money is a great way of losing it.