If you want to have the proverbial crisp picture and good sound, you mustn't forget quality audio equipment.
Of course, it all starts with a microphone , e.g. from the great Japanese brand Azden, which offers professional rifle and compact models for DSLR/DSLM cameras; for cheaper setups, products from the popular Saramonic brand are a good fit.
The combination of a portable console and recorder is also a must-have, where the Yamaha brand has been a respected name for years. Just as respected as, for example, the Sennheiser legend in the field of wireless systems.