How can I curl my hair?

Im debating if I should try sea salt, but I would have to put sea salt and water in a bottle and spray it like that, would that work? NOTHING works for me I tried EVERYTHING... curling with a straightener, 2 different kinds of rollers, braiding it 2 different ways, moose, hairsprays, other hair lotion stuff, 2 different curling irons, curling it with dirty hair, clean hair, blow drying it, scrunching. With a curling iron it does work, but only holds for about 2 minutes. HELP, is there anything I can do? ANYTHING? except for going to a salon. My hair is thick, and long.