The Pennsylvania Courts website links to the petition for an emergency protection from abuse order (but not for the final order). And it also links to the petitions for emergency and final orders against sexual violence or intimidation. Forms for protection from abuse orders are also listed separately by county - here are two counties, for example, that publish their forms online: Bucks County and Philadelphia.
You can also find additional forms for custody and other proceedings on the Pennsylvania Courts website here.
The clerk of court at the courthouse can provide you with the forms that you need to file any petition. To find the courthouse in your area, go to the PA Courthouse Locations page on the website.
Someone in a domestic violence organization in your area may be able to help you get the forms and also help you through the process. To find an organization in your area, go to PA Advocates and Shelters.