Hi, welcome to the forum. Some ladies will have different techniques but I cowash weekly depending on what I am doing, I will either
a. wash like normal just use conditioner and leave it on a bit longer because it takes longer to shampoo with conditioner.
b. apply to my dry hair to get better use out of my conditioner. The massage my scalp to help clean and rinse
Whatever you decide don't tangle your hair while washing because you will break a lot of it by trying to detangle.
I use cheapie coditioner like suave an VO5. I usually add an oil to it. Last time I cowashed I used a cholestoral conditioner and pantene pro-v but that is supposed to have cones in it which buildup in your hair and it's not good to have that but I don't care I use it sometimes and then just clarify which you should be doing anyway. Hope that answers your question.