"What I've been telling my wife is that when we do a rocking SS with a QQ to the side, thats the signal for a transition to SQQ, when we move into prominade, thats a signal that were going back to SSQQ. I like to keep things simple, but was wondering if there is a better more accepted way of doing these transitions for us newbies."
Each figure, regardless if it is SSQQ or SQQ should have its timing communicated not by some pre-arranged signal, but by the pace of body movement and rise/fall through each step.
If you are dancing a slow that is going to be followed by a second slow, you will stay down and the pace will stay constant.
If you are dancing a slow that is to be followed by a (risen) quick, you will create a bit of an upswing and a pickup of the pace.
(If you are dancing a slow that is to be followed by a non-risen quick, then you'd just have the pickup of pace, without the upswing)
Some pairings of figure-then-figure will be more practical than others, but you should be able to join any practical pair by leading it in a way that indicates its timing. That leading doesn't really have to involve much more than dancing your own part with a clear and accurate sense of timing and rise and fall.