W.M.
My husband is in landscaping and here are his thoughts:
You need to amend the soil as much as possible by adding sand, compost, organic matter, etc whatever you can do to improve the soil. You need to till it all together or mix it in the best you can. This makes it more dirt-like and improves its profile. This can be done at any time, spring or fall, sooner the better. Fabric is not necessary but feel free to mulch in the fall to protect the plants through the winter. You are going to get weeds whether you lay fabric or not so it is better for the soil to not lay fabric. You can spray herbicide/round up whenever you see them or you can pull them. The fabric breaks down and adds to the soil, the mulch will not get to the soil b/c the fabric is a barrier. The weeds can grow from your yard or blow in and grow in the mulch. Having the fabric does not prevent weeds. You are wanting to grow your soil and make it more organic so you need the natural land and mulch to help mix with your soil for long term health. Hope that makes sense, I made him explain it in woman's terms! ha ha Use the compost and and natural fert if you want to...it all helps. Using Miracle grow does help. The mulch protects the bushes through winter so start now. Reapply mulch in Spring if needed and spray for weeds regularly.
Good luck, and good for you taking care of all things by yourself. Hopefully your husband will be home soon.
W.