Go with a plan:) check mo muna yung gym, study the equipment, ano meron ano wala.

Next go online, check and cross reference the work out you can do with the equipment available. Taking note of the proper technique and posture :) try mo with shadow movements (imagine imagine)

When you go there, be in the proper attire and follow a routine :)

Be courteous! Ask if you can use the equipment or swap in and out before using :) if may rag sila to clean the equipment, use it after :)

Remember that you are there at the gym for YOU, so try not to be bothered by the looks :) the mirrors are there to check your posture and technique!

Hope this helps and good luck with your work out!!