I'm pretty sure i broke my index finger. Am I properly fixing it by doing this?

My index finger is swollen up pretty big I think it’s broken in the thickest part the finger (between the knuckle and the first joint), does anyone know the proper way to fix it properly?

Right now I made a makeshift splint out of 2 pogo sticks, electrical tape, and a bottle cap. but how long should I keep the splint on, should I not even use a splint, etc..