Section 8 I am trying to apply and I don't know what do I go on to apply

Hi do any one know how to go about applying for section 8 and also do any one know of any other programs that can help us because I have a 11yr old daughter who I am trying to take care of and she has autism and we are looking at eviction and we have know family and on other places to go I been calling shelters but they are full and I am mentally not good I am seeing a counselor and I have to schedule a n appointment with a psychiatrist so I’m just not well and I don’t know what else to do can someone help me please