Help me bury my mom

My mom just recently passed away on September 15th, 2018. She had been in the hospital since September 4th, the morning of the 4th my little brother had come into my room crying and screaming that something was wrong with our mom so I ran out of bed to check on her and she was having a seizure, and she had never had seizures before. So we called the ambulance, and from then on she had just gotten worse everyday. Her heart ended up stopping and the nurses couldn't really give me a straight answer as to why she got so sick so suddenly. 
So now its just me and my two little brothers. I'm 21 and trying to figure everything out, I've never had to do this before and I feel scared and confused. Anything you could donate to our mom's funeral would be greatly appreciated and helpful. I have called around and asked if any of the funeral homes could work with me and set up payments, but unfortunately everyone would like everything up front.. And with me being so young I have pretty much nothing saved. So if you do help out, just know that I deeply do appreciate it, thank you again!