2002 Chevy Camaro Problem getting into gear

I have a 2002 Camaro with a 6ap manual transmission. Started it today and could not get it into gear. turn it off then it can go into gear. The clutch doe snot feel as firm. I think it maybe low on fluid for the hydralic system. Where to you check it, how where is it etc..

Thanks

It was the fluid level and I found it. Why woudl it be low, only a lead? id not see any on the ground but car 6+ years old now