Hi, I am wondering if anything is known about irreducible representations of a semidirect product over $C_p:=\mathbb{Z} / p \mathbb{Z}$ in general or at least in special cases. For example of $C_q \rtimes C_l$ over $C_p$, where $p,q,l$ are some primes. Is there any well-known literature?

Thank you for hints!