Month end processes in AR..?

What are the steps we follow in month end for AR..? i.e End of the month (EOM) processes we do in Accounts receivables to begin a new month as well as to close out previous open months. Please suggest me some of the , • guidelines to create new accounting periods, as well as closing out older accounting periods. • and for proper allocation of payments, and adjustments to the appropriate accounting period. What are the jobs names and steps we need to follow..Please enlighten me on this