Don't use an SM57. It has no pop shield. It is an instrumental mic. Use an SM58 or better a series 1 AKGD880S, AND put a pop shield on. Sing into the mic, but not TOOO close. About a thumb's length to a handswidth off your nose is good. Maybe a bit closer or further away depending on how much proximity effect (the bass boost when you get really close to a cardiod or supercardiod mic) you are going to want and how often you are going to want it. The nose is an important resonant cavity.

The foldback (or monitors) are there so YOU can hear what you are doing. They are NOT the same mix as the front of house. With them set right you will hear only them (maybe a bit of acoustic sound from your own guitar and/or the sound of the backline - oh, and the drummer) and maybe a bit of woolly backwash from the FoH (bass is omnidirectional, treble is very directional). You DON'T need kick drum or bass guitar in the monitors.

Be awkward until the monitors are right - not providing what you want to sound like but providing what you need to make sure you are in time and in tune and the right level relative to the other members of the band (if you are sharing a mix - it differs if there are several monitor channels). The soundman SHOULD have headphones switchable to every monitor channel and do exactly that.

Only after the monitor is right should the sound man then bring up the front of house - and you have to trust him to get that right. You can't hear it. I usually bring the kick drum up to instant puke (if I have enough power) and then turn it down a bit and then add other stuff over it. It may help to have a sensible and knowledgeable friend who understands your band and your sound and sound production stand next to the soundman to advise - not to criticise, to advise.

Oh, and if the soundman is not driving, a beer for him is good too.