Hi, so I'm getting married in 4.5 months. I've already lost some weight with deficit and Couch to 5K, but I'd like to get into lifting. I know that the best things for me are free, very defined programs where I just turn up and do as I'm told (which is why C25K worked so well for me). If there's any room for me to be unsure, or money to spend to be a deterrent, I'll procrastinate and just won't do anything. From googling around, it seems like Stronglifts is what I need? But I can't seem to find any actual program for it, just lots of "Stronglifts is great! Just follow the program! It's so simple!" But... What program?? When I DO find something, it's like this:
Squat 5x5
Benchpress 5x5
Inverted Rows 3xF
Push ups 3xF
Reverse crunch 3x12
And I don't understand what it means

I'm guessing "5x5" means five sets of five reps? But what does "3xF" mean? And what are the actual exercises? If I go into the gym and look at the machines, will I see something that says "Inverted Rows", or do I need to know what those are before I go in? And how do I know how much weight to lift?
Stupid questions!
Basically, I'm a TOTAL beginner and I'm scared and overwhelmed and could use someone to hold my hand!