Being curly has honestly been the least I've ever spent on my hair! I used to buy expensive serums, heat protectants and flat irons to keep my hair straight. I second the vo5 and suave recommendations. I personally use a shampoo every other wash (once a week) and have no problem. Don't worry about rules, just do what your hair needs!
2b//high porosity//fine texture//medium density//low elasticity//loves protein
Lo-poo: SMMR, SMC&S
Clarifying: VO5 shampoos
Co-wash: VO5 conditioners
RO: VO5 conditioners
Styling: AIF, FSG, gelatin gel, ecostyler krystal
PT: IAGirl's gelatin treatment