Learn a push and pull exercise for upper and lower body - upper could look like a lat pull down and bench press - lower could look like a leg press and a Romanian dead lift (RDL). Look up those exercises and watch tutorials on YouTube. Staff are also there to help if you don’t know how to use the equipment. Those exercises target certain muscle groups, in order: lats, chest, quads and glutes. Learn where those muscles are and keep them engaged throughout the movement.
Once you feel comfy with those lifts try to learn another 4 push pull upper lower exercises that target different areas of your body. Think triceps, biceps, and deltoids (shoulders) for upper and glutes, hamstrings, quads and calves for lower. You can even look up push / pull exercises for (insert muscle group) and from there you can learn a lot. If you are a runner you might want to do some calve exercise and core exercises, those are awesome for supporting your training.
Start with 3-4 sets of 8-12 reps. That looks like 8 squats rest 8 squats rest 10 squats rest 12 squats FINISHED and move on to the next exercise Start with light weights to learn the movement before bumping the intensity up. Listen to your body and ask for help from people who work at your gym, they love to help.