How can I respond to the divorce complaint? Help!

My husband started seeing another woman. My PI caught him meeting up w/ her on video. After that, he moved into the guest room. 2 months later, he filed for divorce, and a month later, he moved out. The no-fault AND fault (he's accusing me of indecencies against him) papers were filed in December. I'm a stay at home mom, and we have no joint accounts. I am unable to borrow money from family. I have not been able to respond. Although I know PA doesn't do defaults, and I have time, he wants this over fast, and now so do I. We have a child, and I'd like custody to be decided and on paper, as well. How can I possibly make this process go any faster when I can't even afford to hire an attorney (PA doesn't have free legal help for divorce and all the retainers start at $1500!)? Any advice?