Check out you tube.
Here is a step by step tutorial for you: https://www.homedepot.com/c/ah/how-to-install-a-gas-water-heater/9ba683603be9fa5395fab904e98440f
Is your water heater electric or gas Cynthia?
Depending were you live, some states require a licensed plumber to install for you.
I am in CA and we can install our own, provided you know what you are doing. I did it myself as I was not going to pay over $700 to swap out my gas water heater. Get help as even a 30 gallon tank is cumbersome. Here are some sites for you.
Go to the brand’s website and download the installation guide for your model. These days they usually also have links to videos.
Ok kool thank you