Raised bed question

Raised bed question

Hello everyone, I scanned through the raised bed tag questions and it looks like there are quite a few people here who use them. I need your wisdom, oh wise raised bed gardeners! I am contemplating using (heck, I already built it) a raised bed but I have a few questions. I want the raised bed to be located in a particular spot that gets excelent sun exposure. This spot is right next to my house. It is now covered with landscaping fabric and small pebbles on top. The bed I built is just 4 walls at the moment (no bottom). My concern is that the bed will be located just 1 foot away from the house wall/foundation and I am paranoid about excessive moisture getting under the house. Shall I build a bottom for my bed, raise it a few inches off the ground and construct some sort of a drainage system that will divert any excess water away from the house? I am thinking that if I just throw the landscaping fabric under the bed to prevent the soil run off, I will end up with a lot of unwanted moisture under my house. Am I right? Am I too paranoid? Any thoughts? P.S. I plan to grow tomatoes and other vegs in this spot/bed, if that matters. Zone 9 in NorCal.
My New Apt!

My New Apt!

My favorite time of year!

My favorite time of year!

Mary Mary Quite Contrary

Mary Mary Quite Contrary

Backyard in progress

Backyard in progress

Dahlia pics

Dahlia pics

More roses making an appearance and my first lilies of the year

More roses making an appearance and my first lilies of the year