T. Lynn, Welcome to iRV2.com. We are glad to have you join us. Congratulations on your new to you travel trailer. Keep the tank valves closed and add a few gallons of water into the toilet. You will want to use toilet tissue that breaks down quickly and most of the time a septic tank approved one is fine. To test you can use a masson jar (or similar) and put a piece in it with water and give a little shake. If it breaks down it is fine. You also may want to use something for odor in the tank; be sure to use a non-formaldihyde base chemical. We use a simple enzyme base and there are many brands and scents. Allow the Black tank (toilet) to get at least 2/3 full before dumping. If you are only 1/4 full and want to dump keep adding plenty of water to get to 2/3 and then dump by connecting the sewer hose to both the tank outlet and the sewer connnection and pulling the larger of the dump valves first. This is the Black tank valve. After you hear the end of the contents pass thru you can rinse through the toilet (a hose or better yet a toilet wand with spining nozzle) will rinse the tank while the valve is still open. Close the valve and ad a few gallons of fresh water. Now you can dump teh gray tank (smaller of the valves) and this will also help rinse out the sewer hose. There are for lack of a better woor chemicals fo both the black and gray tanks. I would recommend a coconut base lubricant to be added after dumping and valves closed to keep the rubber seals in good shape. This can be done a few times a year. Always keep water standing in the bowl of the toilet. A little cocnut oil in here is good too. The idea is to keep the seals wet so they don't dry out and crack. There are many things to learn and we all have had to so don't feel bad if you need to ask more questions. You will find we are a group of fun loving RVers that like to help out where we can. Good luck and stay safe.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7