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.
Seeking some advice

Seeking some advice

flower bed direction

flower bed direction

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Help! Who/What is the culprit?

question, and butterflies!

question, and butterflies!

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Seduction

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Tree ID?