Run fresh water through the system....both city water (through your water hose connected to water inlet on RV), and water storage tank and the 12 volt water pump that pumps water out of that tank (assuming anti-freeze was put into this tank). I usually throw a cup of household bleach into my water tank with about 5 gallons of water for our first trip of the season so the solution will sanitize the tank and remainder of the water system by pumping all that water out of the tank once we set up at camp. Rinse a couple of times with more fresh water.
Check the water heater. Were the by-pass valves turned 90 degrees as part of the winterization process? If so, they need to be returned to the position that allows water in/out of the hot water tank.
Run water out of all the water outlets....kitchen faucet, shower, bathroom faucet, and toilet. Run water through until the pink anti-freeze and smell of bleach is washed out.
I'm assuming your RV was winterized when you bought it. So, you'll probably do the winterizing next fall.
Looks like you might live around Dallas, consider attending this weekend's RV Boot Camp, in Grand Prairie, TX.
Here's the curriculum: https://www.escapees.com/education/rvers-boot-camp/
Here's registration info: