need help to figure out a hair care routine to get healty hair

curently my hair routine is a bit scarces this is what i do. in the shower i run my hair under cold water and then masage my scalp with a silcon scalp massager, on ocassion i use conditionair if my hair is feeling a bit oily, and very rarely do i use shampoo only if ive put alot of oil in my hair or if i have been swiming or if my hair has gotten dirty (ive heard no shampoo is good for your hair idk how true it is) . after the shower i get a little bit of coconut oil and massage it into my scalp and let my hair air dry. i have wavy 2a or 2b hair. i do have hairfall im not sure if it enough to be actually concerned, but i am sort of concerned. my hair does get abit oily not visably but if you run your hands through it they will get slightly oily. im also a male and 17 years old if that is of any value ( if you need any other informantion dont be afrid to ask )