get rid of weeds then re-plant?
I have a garden/flower bed in my backyard. This year I did not get time to plant anything and it became overgrown with weeds. In addition, I added more dirt to the bed from where I had dug for a shed in my yard, and that dirt had grass in it. My question is, is there an easy way for me to kill all of the weeds/grass or whatever is growing in there right now to prepare for next year to be able to use my garden with a clean slate, so to speak? I thought I could use weed killer but how long does that stay in the soil? Basically I want to be able to use the soil about 8 months from now so I would be happy to hear any suggestions. Thanks!