Can I get spousal support even if I'm married to my husband for only four years?

Me and my husband are married for 4 yrs now, we don't have a child but he's got 4 from his previous marriage and they all live with us. My husband handed me a divorce packet 3 days ago. He had already filled up some of the information's and he wants me to sign it right there and then so we can both move on according to him. I told him I would have to read it first and most likely seek legal advice before I sign it for I do not understand some of this legal matters. He insisted, so he started explaining here and there and rush me to sign it so he can have it notarized that day. He then ask me to move out of the house as soon as possible like the next day. I don't have money to get a lawyer as I just started working after my surgery. I only work part time at least 20 hrs a week on a minimum wage. I don't know how to drive and it’s even harder to get more hours due to my transportation issues for my husband does not like the idea of taking me to work and picking me up because according to him he's making a compromise and seems like an ordeal to him. He said that if I get an attorney I am going to make things complicated and they will suck out money which I do not have. He checked the box that said he doesn’t own any real property, that there's no spousal support, that any court fees are to be paid equally between us, something about irreconcilable differences and that we both agree to this. As far as I know, my husband owns this mobile home where we live but he paid for the monthly land rental and currently renting out another single wide mobile home that is closer to ours which he owns at the same time. He's self employed, he owns an online business and advertising and obviously makes more money than I do. What are my legal rights here? Do I get spousal support? Am I entitled to a portion of my spouse's personal property or business?