Help build a room for my son

I've been desperately trying to build my 12 yr old son a proper bedroom of his own. Something he's never had. At the moment my son and I are in a split room with a makeshift wall and it's so small I've had to cut a large hole in the wall so his feet and bed will fit He's no privacy and neither have I. I've struggled by myself for so long to try and do it but I live on the bread line and I just can't do it. I work but only part time as I'm a single parent. To build his room it needs work I just can't do and need to pay trademen to come in to do it I would be eternally grateful if anyone can help in any way please You would be making a little boy so so happy!