We all start somewhere. Just look up what you need to as you need it. After awhile you'll know how to do everything you need. I've never found personal trainers useful unless you're literally starting from 0.
Mine was 24 hours so I liked that a lot. I can't use a treadmill in my house because my basement ceilings are too low so mainly used that. But it was $10/month so basically chump change.
Honestly for the price planet fitness is not bad at all if you just do your own thing and ignore everyone else. the gayest thing is the lunk alarm but I've never even seen it go off at mine