My sons father is taking me to court for SOLE CUSTODY!!?

I am 22 years old (full time mother) to a 2 and half year old beautiful boy. I am on welfare and have a nice apartment (not housing) and I also get support from my mother she has been buying me groceries for 2 and half years since my sons father refuses to pay child support. My sons father is 23 years old and has A lot of money, he has a lawyer and I don't and HE FILED COURT ON ME! We both have shared custody since we are both on the birth certificate. I am a stay at home mom, I have been taking care of my child and so has he but he started paying me $198 a month for about 5 months because my social worker demanded it. in October my sons father put my son in daycare Without My Consent!!! and stopped paying me child support all of a sudden!! I went to my social worker and they gave me a paper to show me how much he owes me in child support including the times hes missed and including INTEREST! My sons father makes me have him on the weekends now but I personally think he is doing this because his girlfirend (That he has cheated on me with when I was 7 and half months pregnant) Keeps telling him to take me to court and get SOLE custody and the court papers say he wants me to have supervised visits as if I'm some crack head or something (I DO NOT DO DRUGS) I am a good mother and take care of my son better then my sons father (his sisters and his girlfirned take care of my son and pick him up from day care since my sons father works 9-5 Job) when my son is with me he gets my FULL attention I am a young single beautiful mother and live on my own and make sure there is breakfast lunch and dinner on the table for my son at all times, I bath him at all times he is with me and take him with me everywhere i go when he is with me. I have court on Thursday at 11AM (June 30th) he lied and said i have no food in my fridge, and says my house is always dirty (I had the police investigate my house and said they have never seen a place so clean and nice since i keep my place well kept and they seen i had food in the fridge!) He says my hallway stinks of marijuana (witch is true) but only because my neighbors are pot heads and they are getting evicted they are moving next month my landlord found out they are selling drugs in the building so she evicted them! CLEARY my sons father is doing everything he can to lie on me just to win, wont it show he is trying to take my child from me because he clearly does not want to pay child support and he says he is takin me to court because I have no MONEY!!! Obviously not I only get enough to pay my rent and my mother provides the groceries since he refusees to pay child support but instead Pays the daycare teacher 800 DOLLARS a month! to do my job !! The only thing I am bringing with me is my witness's and my mother (my second sons father should I say) and the paper stating how much CHILD SUPPORT he owes me. My sons father filed for court BEHIND MY BACK but he gave me the court papers LATE (he filed for court MAY 12 2011, AND GAVE ME THE COURT PAPERS ON MAY 31st!) and kept saying he is not going to take me to court if we have a decent custody agreement HENCE why I do not have a LAWYER!!! But I don't believe I need one I am a good mother and I will be honest with the job! Who will be in the court room with us will it just be me and my sons father? or are we allowed to bring our own people? What do you think is going to happen when I go please be specific and detailed please, and thank you!????