i been trying to go though the sewers but i always get killed what lvl to i need to be to get though the sewers im lvl 8 acher

depends on which part of the sewers. i would say to clean up the basic sewer and do mekrath's stuff, level 8/9 is 'nough. to get through the cult of the unseeing eye, you need to be level 12/13. finally to kill the lich, i think level 13/14 - now this is all without cheats including cheated weapons.

You definitely shouldn't be taking on illithid or beholders at level eight. If you're talking about that group of mercenary-blokes in the northwest corner, use emotion and chaos on them and they should be easy enough to beat.