Hair background -:straightened my hair for a year and a half. On 3rd BKT. Never had a perm. Naturally had 3b hair.

I did something really stupid a couple of months ago I decided to transition but the two textures of my hair drove me crazy so I gave in and got another BKT (I had previously had 2). I've finally decided (for real this time) to transition back to my natural hair but I have a question:

Do i shampoo my hair or start cowashing right away? If I were to wet my hair it would be wavy with a half inch of curly hair at my scalp.
(Naturally a 3B) transitioning from 3 keratin treatments and straightening.