If your are getting a loan for the property they will start the loan process by ordering an appraisal, survey or improvement location report and getting the necessary documents together for their underwriters.
There are many delivery dates in the purchase agreement . These include a delivery of the seller property disclosure. This disclosure is very important. Make sure it is accepted and signed by both parties.
Other dates include inspections, insurance application, home owner or condo association documents etc...
Your Realtor will make sure all these dates are met.