Hello and
Hey, have to start somewhere... there are lots of things you can do without having to get into the floor.
Something that I have found helpful... and inexpensive.... are 3 pound Danskin soft weight balls. I became familiar with these when I was having trouble even standing or walking. You can do a lot of arm and upper body exercises lying on your bed even.
I hope you find a plan soon that is right for you. This is a great place for advice and encouragement.