What kind of wall board do I need to use if I am going to install tile

It's best to use backer board. It is sold in the tile department of any home improvement store. It's a water barrier and has very little flex which will help your tile to hold up. (Ps get tile spacers while you are there. They make the job easier)

Hi Valerie, how exciting! In the bathroom you will need to use concrete backer board, it will help prevent mold in that moist environment and provides a strong base for your tile installation. Talk to the sales people at your home improvement store. It comes in sheets just like dry wall. You got this!

https://www.familyhandyman.com/tiling/tile-installation/selecting-a-tile-backer-board/view-all/

Cement backerboard provides a strong and moisture-resistant foundation for shower tile. Do not use drywall. Installing backerbaord is similar to installing drywall.You don't need to cover your entire bathroom in backerboard, just the wet shower area.

If you are tiling a shower area, you need more than just backerboard. There is a special rubber liner to use in the shower area too. If you are just tiling your bathroom walls however, the backerboard isn't necessary. Here is some good advice from Lowes. Best wishes!

https://www.lowes.com/projects/build-and-remodel/prep-a-wall-for-tile/project

Cement board in the shower. Be sure to use a special sealant to make it water tight. Green board if it's in a damp area. That gets sealed, too. Then regular drywall on the rest of the walls. There are lots of videos out there on how to do it, but use the one from your tile manufacturer as he knows his product best.

Cement board in the wet areas. Green board in the rest of the bathroom. I've put in 7 bathrooms in the last 4 years. After tiling, don't forget to seal your tile and grout, it makes it a lot easier to keep clean. And don't forget a good exhaust fan!