After the beds are tilled well they need to be formed. Many people like straight lines and that is the easiest way to manage the beds but it isn’t always the best way. If the bed if fairly flat then by all means go straight, put up strings for a guide if needed. Straight beds make it easier for harvesting, rolling carts, and weed barrier application. However if you have a slope in your bed the tilling/paths/plots should be on contour to decrease erosion and retain moisture.
Standard bed size is 30″ for little farms so depending on your tiller size you may have to make a few runs. When you are tilling stand off to the side so you don’t walk where you will be planting.
Last year I put down weed barrier on my paths and wood chips from the power company, that worked pretty well. Weeds didn’t grow up and the wood chips broke down. Afterwards I take up the weed barrier to use next year and the wood chips are organic matter for the bed. I let my chickens in the garden and they spread the chips around well.
The paths are normally going to be between 6″ and 18″. I generally make mine 18″, one reason is that weed barrier comes in 36″ rolls and I cut it in half while it is still rolled from the factory, secondly I will plant seeds right at the edge of the weed barrier and the leaves will over hang on the path if I did 6″ I couldn’t do that.
The next step will be raking out all remaining debris, do that before making the paths.