Start putting in your plants; work the nutrients into your soil. Wet newspapers and put layers around the plants overlapping as you go; cover with mulch and forget about weeds. Weeds will get through some gardening plastic; they will not get through wet newspapers.
The newspaper will prevent any grass and weed seeds from germinating, but unlike fabric, it will decompose after about 18 months. By that time, any grass and weed seeds that were present in the soil on planting will be dead. Its green, its cheaper than fabric, and when you decide to remove or redesign the bed later on, you will not have the headache you would with fabric.
New - Low Rider Swivel Scoot puts plants within easy reach. Rolling scoot with swiveling contoured seat lets you tend plants from a low, seated position, extending your reach and preventing strain in your shoulders, lower back and knees. Swivel the seat to adjust it from 9" to 13-1/2" high. Durable powder-coated steel.