Re: using landscaping fabric in beds?
If you don't care about using chemicals, you can scatter pre-emergent before applying mulch. If you'd prefer to not use chemicals, a thick layer of mulch usually will keep most things smothered out. Another technique is to only water at the planted specimens, don't broadcast over the entire area as all that water will promote growth, spot watering reduces the germination of the weeds.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!