To make a raised bed you have to make sure it is narrow enough to reach their center from each side. Measure and mark out the beds. Edge with 15 x 2.5 cm boards, sunk into a 5 cm slit trench and supported by timber pegs driven into the ground every 1-1.2 m. Fill the bed with good-quality topsoil mixed with organic matter like well-rotted manure or garden compost. Take care to avoid creating air pockets at the edges and corners.
Spread out the soil evenly in the bed using a rake then break up any lumps in order to obtain an even and firm texture. Make the finished soil surface roughly level with the top of the boards, topping up with soil as necessary. Level the soil with the back of the rake to leave a smooth surface. Top up with more soil in later weeks when the soil in the beds will settle and the level of the soil will fall.
To make a path between your beds you will need to mark out, level and firm the path first. Then cut a 2.5 cm slit along each edge. Cut some landscape fabric to length and 20 cm wider than the path itself. Place the fabric centered to the path so you have equal material left on each side then fold the fabric edge into the slit on one side. Secure the material with 10 x 2.5 cm wood edging and hammer level. Then pull the fabric taut and repeat on the opposite side.
Cut crosses in opposite pairs in the fabric close to each plank 2 m apart. Then knock a wooden peg through each cross to 2.5 cm below the plank top. Apply the mulch using the type of mulch you like, like gravel or bark chips. Rake and tamp down so that the mulch is level with the plank tops and the support pegs are concealed.