When you say you can't get "it" to stay in one place, are you referring to the machine or to the fabric you're trying to sew? Does your sewing machine have an instruction booklet or a model name/number that you can search on google to locate the instruction booklet in a PDF format online?
What it sounds like to me when you say you can't get "it" to stay in place while you sew is that you haven't lowered the foot of the sewing machine. The foot effectively holds the fabric still and presses it into these small grippy bits beneath the fabric. The grippy bits move the fabric at a steady rate through the machine, and all you have to do is feed the fabric through and keep the seams straight.
But if you're a sewing noob, you may not know where to find the switch for lowering and raising the foot. So that is why I suggest you find an instruction booklet on your machine that has a labelled diagram of the bits and bobs, levers and dials on your machine, what they do, and how to use everything.
Also, if the thread was jamming, that could mean a few things. Perhaps you didn't thread the machine right, or the thread you're using is too heavy and the loose fibres are what got caught up.