Child custody and child support in Okc

Hello, I’m a mom of a beautiful 2 year old boy. My sons father and I have never been to court for anything regarding custody or anything written on paper. I’ve been thinking for a while now but am so scared about going to court over custody of my son just to have something documented because I feel as if my sons father and family try to have so much control over the decisions of my son. I have my son from Sundays to Friday night when he goes to his fathers every week. His father still lives with his parents and hardly provides for my son financially as his parents do it mostly. I have never asked for anything much regarding my son from his dad as I’d much rather do it myself. My sons father has never stayed with or visited him in the hospital when my son has went and had to be there over night or for a few days. He has only ever been to one of my son’s doctors appointments and that’s when my son was a few months old. My sons fathers parents pick up my son on Friday and that has recently just started about a month ago when we moved further away from them. Before that I was the one to always pick up and drop off my son. My sons father really don’t have much communication whenever I’m needing something regarding my son as I always communicating with his family. And have noticed his family are the ones that mostly watch my child. I have provided for my child the day he was born to now and never asked for anything regarding him other than them watching him when I’m needing help. His dad can be so disrespectful as well as his grandmother on his dads side. I’ve also noticed that every week my son goes over there he is not on a set schedule and they let him sleep late because he likes to “fight his sleep”. As when he’s home with me, he goes to sleep around 9-10 at night and wakes up at 6:30 everyday so I can take him to daycare. My son has his own room with me and my boyfriend and I worked so hard to get to this point of my life. That’s just someeee of what I’d had to deal with. Wellll anywayyysss a couple of weeks ago my son’s grandmother recently learned of the fact that I have to put my sons father on child support for soonercare and I could tell she was upset about my decision in doing so and made a comment stating we have 50/50. It kind of irritated me and I feel as if she was trying to make me feel bad. I really have no family. My support group is small. But I have documented so much since the day my son was born. I guess what I’m really trying is that I’m so scared. His family has money and I need opinions and support and help on what my rights are.