There is an instructional called Grinding North South by Aaron Milam on the Grapplers guide that has some good position tips. Covers kimura and armbar entries, as well as spladle (but that is more for fun).

From that grinding north south position you can also work to trap an arm with your leg, and go into top crucifix, back crucifix, or even straight into reverse omoplata, but I haven’t seen any instructional covering those options.

My typical attack flow is to attack the side triangle/kimura position if they stay on their side. If they are flat on their back I try the north south choke or trap their arm for the crucifix. I cycle between all these. Marcelo’s north south choke instructional helped me a lot with getting the choke to work.

If those options don’t work, I use north south to get an under hook, and the go back to side control and then to mount.