Hi all well today i chang all my exhaust and nuts for bass, went well

.but in doing it i take off the tin cover to the head as it was on the exhaust,then i saw my cylinder heads,and it look like there been water leking then i saw a litte drip of water for the cylinder head,oh now i think this could be head gasket slowy goinng,if im right i need to fine some one that could do this job as i be no good doing me self,so any one could help me out with any info be gart or evern so could do the job

iit only one side of the head leking
me van a 2.1Dj watercool 1987
chris