It's hard to say what it will look like grown out because curl pattern changes a lot with length.

If you're sticking with natural then just use a "clarifying shampoo" that does not have cones but they will have one of the sulfates. You can create the suds and just use some of the suds massaged into your scalp and then rinse. Unless you have heavy buildup on the hair you should not add directly to the hair.