I only have hand tools available to make a mortise and tenon joint, could someone please tell me how to do this? Thank you
Have you got a mortise chisel among your hand tools? If not, you'll have a miserable time. If so, you use your marking gauge to scribe a tenon the width of your mortise chisel, and cut that out with your backsaw (or preferably your tenon saw, which is a smallish backsaw of the rip persuasion) and you scribe around the mortise, then chop it out with your mortise chisel, which is a stout and sturdy beast made to take some serious pounding.
Some wimpier chisels are (mis-)labeled as mortise chisels in the modern trade. One like this will run rings around them.
If need be you use a plane or paring chisel to make fine adjustments to the tenon for fit.