I'm ready to sell mine and I don't know exactly what I should be looking at in terms of pricing given it's a combo legendary. Any help would be greatly appreciated.

The price of + is currently around 62.5m in SS (but it'll jump about 10m if the current cheapest Aemis is bought). Legendaries are pretty much just collector's items at this point and not used for battle. I don't know what kind of market there really even is for them, but I wouldn't expect more than that

Look up previous legendary price checks. The value is generally less than the sum of its parts.

Risen is made of the two most common legendaries, and they're both buyable right now.

Ah, alas. That's still more than I've sold some combos for in the past though so thank you both.