Help with SourceMod plugins should be posted in the SourceMod section.
General advice:
You should simply start reading the errors. Most errors are quite straight forward. Fix the first error then tray again. If it still doesn't compile, fix the next error. Repeat. Ignore warnings until you have the errors fixed. If you can't seem to fix an error, go to the next one. Fix as many as you can yourself then you can ask specific questions.