The dichromatic number $\vec{\chi}(G)$ of a digraph $G$ is the least integer $k$ such that $G$ can be partitioned into $k$ acyclic digraphs. A digraph is $k$-dicritical if $\vec{\chi}(G) = k$ and each proper subgraph $H$ of $G$ satisfies $\vec{\chi}(H) \leq k-1$. An oriented graph is a digraph with no cycle of length $2$. We prove various bounds on the minimal number of arcs in a $k$-dicritical digraph. We characterise $3$-dicritical digraphs distinct from symmetric odd cycles that have $(k-1)|V(G)| + 1$ arcs. For $k \geq 4$, we characterise $k$-dicritical digraphs on at least $k+1$ vertices that have $(k-1)|V(G)| + k-3$ arcs, generalising a result of Dirac. We prove that, for $k \geq 5$, every $k$-dicritical digraph $G$ has at least $(k-1/2 - 1/(k-1)) |V(G)| - k(1/2 - 1/(k-1))$ arcs, which is the best known lower bound. We prove that the number of connected components induced by the vertices of degree $2(k-1)$ in a $k$-dicritical digraph is at most the number of connected components in the rest of the digraph, generalising a result of Stiebitz. We deduce that every $k$-dicritical oriented graph $G$ has at least $(k-1/2 +3/( 8k-16))|V(G)| + 1/(8k-16)$ arcs, which is the best known lower bound. Finally, we generalise a Theorem of Thomassen on list-chromatic number of undirected graphs to list-dichromatic number of digraphs.