I need help

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Alright, I have to set aside my stubbornness and ask for some advice. I've lost around 160lbs over the course of the past 2 years. I have roughly 35 left to go before I'm at my goal weight, but because I didn't lift on the way down I have almost no muscle left. I'm currently in a very bad financial situation and cannot afford to join a gym, but somewhere in the next week or two I'm getting some equipment to use at home to get me introduced to lifting. My real problem is that in the mean time I've been trying to do some bodyweight exercises for at least some type of stimulation that isn't cardio, but I can't do anything. I cannot do a pushup, sit up, or even squats. Where the hell do I even start? Being fit is my goal, so I feel that I need to know how to do these things. Any help for me here?