First you need to dig the soil and remove large stones and weeds.
If the soil is impoverished, add potassium sulphate as fertilizer and turn the soil over again.
You will need to know the species of bulb to plant because the depth of burial will depend on it.
Depending on the characteristics of the bulb, you will have to dig holes of different depths.
To make the holes, use a shovel with a sharp tip or the whitener.