The main thing I'll say is don't over complicate it. You don't need a final wash. Just start co-washing and using cg friendly products.
I co-wash (scrub my hair clean with conditioner) once a week, rinse then apply a tiny bit of curl cream and some gel to soaking wet hair, still in the shower. When i get out, I remove excess water by scrunching gently with a sports towel.
Applying the products to soaking wet hair was an absolute game changer for me - it really does seem to trap the moisture into my hair and give amazing curls.
Join a curly girl group on facebook for hints and tips and you'll find recommendations from other people with similar hair to you.
What i would say is you shouldn't need much - it doesn't have to be complicated so you can get away with a 99p alberto balsam conditioner from home bargains and a gel like one from asiam, boucleme or the blue LA Looks gel from amazon which is good value.
Personally, I find the CurlFlo products to be amazing and have now switched from Boucleme. They smell fabulous and i get zero build up on my hair with them, even after a week my hair still feels light and fresh.
But don't be put off by all the talk of multiple products and masks and rinses and the likes. Just get a smooth towel, a conditioner and a gel.
Good luck!