I know how to M1, but do I knit 1 AFTER each M1?
If the pattern says M1, K1 then yes. Can you provide a pattern name and link? Or at least post a few of the lines…generally the one you are having problems with and the one before and after. There’s just too many patterns for us to know the instructions of them all.
It depends on what the pattern says comes next. If you do a M1 between stitches then you would follow the next direction. It may or may not be a knit stitch.
Do you want to quote a line from a pattern or give a specific example?