Send an email with the subject “Property Specific Letter Request” or something like that and maybe give the address of the property as well. Your agent will need to supply the MLS Listing as well as the most recent tax sheet.
P&S is a Purchase and Sales contract. Once you have an accepted offer on a home, this is the contract that you will be signing along with the seller. Your realtor can help you with this but basically as @Nelsont mentioned, this is a document they will have. You and the seller will have to sign it and it will contain the purchase price, concessions, and any other addendums to the contract.