Hi everyone, hope everyone is doing well.
I am currently in the planning stages of converting this small patch of grass to something nicer.

I have put together my current plan below, with 2 small gardens and a main stone path with pebbles all around.

My main questions are:
1. Once I remove the grass, what would be the best material to use to level and raise the area? As currently it slopes down a lot and as you can see, the house foundation is exposed more toward the back which I'd like to cover up. I'm still planning on having it sloping away from the house, I just want to raise it a little bit so it's not as noticeable.
2. With the garden plan against the house, is there a material I can use to protect the foundation and house from the dirt and moisture?
Other than that, I am confident at doing the rest, it's mainly these things I am worried about.
Many thanks.