Need advice i don't know which flair to use for it first time asking for advice for hair.

You dont have to read everything I'll explain it from paragraph on whats happening, but I'll try to summarize the problem below, (p.s sorry my english is not perfect it's not my first language)

I'm trying to grow my hair longer,

My issue with my hair that I don't understand is that when i have short hair like always do because I don't really change hairstyle (so far ive tried buzz cut, and a few i dont remember, but usually 2/4 or barbers cut) when its short its like frizzly or gets tangled with other hairs but when its growing to a nice length it's somehow straight and I don't know what to call it like it doesn't get stuck to the brush/comb and always flat straight for example i tried wax the bench one and other stuff i forget names because they don't work for a long time like 2 hrs in its goes back straight and not sticky, but when im showering it's like a water Lily that took a long time to absorb water, days after that after i shower i get like sticky hair/gets tangled in the comb/brush when that happens i use a few drops of argan oil and it works ok.

Ok problem and advice needed, I'm trying to grow my hair longer just cause I'm finally able to do so and i want to try having a long hair maybe even style it like wolf cut or whatnot (i just see a lot of semi long hairstyles), i need ADVICE on keeping it healthy so it doesn't have split ends or get tangled with the comb/brush and dandruff . Also after a few years i want to try donating my hair to people who needs it, my mom does it every few years to children with cancer and since I always had to have short hair for 20+years since strict rule i want to try a new thing