Burrows are not something you need as a beginner unless you're doing something unusual. It's best to forget about the feature. For jobs, press (u)nits -> (z)oom

Burrows are not something you need as a beginner unless you're doing something unusual. It's best to forget about the feature. For jobs, press (u)nits -> (z)oom -> (p)references -> (l)abors on your dwarves and adjust their professions, then queue up tasks at workshops.