Curing eggs can seem daunting due to all the different commercial cures out there but, to be honest, you cannot go wrong with any of them you choose.

The two types that most people use are:

Sulfite based (Pro Cure, Pautzke Fire Cure)
Borax (Borx-O-Fire made my Pautzke or your own home made cure).

There are a ton of videos on youtube with great examples of all of these types of cures. It's good watching if you have time.

Basics are: Salmon - Go with sulfite based cures. Steelhead - borax based cures.

There are always exceptions to the rules and you can mix and match your own recipes but that's part of the fun of this whole game.