I’m looking to replace my kitchen backsplash. It was previously regular tile and I’m going to replace it with glass/porcelain tile mesh backsplash.
I have removed the old tile and it appears to be drywall with the old adhesive residue.

I have watched a video where it was recommended to apply thinset to the wall to smooth it across, let it dry completely, and then separately use adhesive and stick the tiles.

The wall is definitely not smooth/flat now. Do you think it’s a good idea to smooth out the wall with thinset first?

Also, do you recommend I apply mastic With my trowel for installing the backsplash or is thinset ok? *I read that mastic is recommended for glass tiles as it dries faster but not sure*. This is my first time installing tile/backsplash.

[This is the tile](https://www.homedepot.com/p/204170143) I’m looking to install.

![enter image description here](https://i.stack.imgur.com/VfMjN.jpg)

![enter image description here](https://i.stack.imgur.com/O05rj.jpg)

![enter image description here](https://i.stack.imgur.com/zemir.jpg)