your looking about 8-9M for a solo delegate for the first month or more of DPOPS
current block reward is something around 54K so if we assume 50K by block 800K

6.4 blocks per day
50K reward
30 days in month

(6.4*50000)*30 = 9.6M

yes you can set the fee from 0-100 so you can charge how much the server will cost