do whatever you feel is right to do next, OP. everyone kinda branches out in their own way, some people are way more comfy with spins than flips or whatever. personally i learned 3s, corked them, got those to 5s, corked them, then thought my first invert should be a flatspin or rodeo but backflip ended up being waaaay easier
if you are really comfy with backflips and youre feeling it, try one on a good jump for it. it feels like doing a gainer except with much more weight on your feet. but the jump helps the flip start really naturally. it's all in the hips with backies, pop well and bring those hips around and look for the landing