As a cash buyer, you can expect an attorney/notary fee for conducting the title search ($500 appx) and title insurance (based on sales price) should you chose to purchase it (I strongly suggest an owners title policy). If there is to be an appraisal, that is generally the Buyer's cost unless otherwise specified in the contract.
Real estate property taxes are prorated. Since St Tammany taxes are paid in arrears, if you close on Dec 1 the seller credits the buyer for 11 months of taxes. Then when the tax bill arrives in Dec, the buyer is responsible for the full tax bill.