You earn money during the night raid, each action generates money (taking of blanket, undressing, touching, her being near wake up state, etc.)
To upgrade camera you need materials such as plastic, metal, glass, etc. either from the shop or found during runs and after defeating enemies (from PC screen access "cam" view and then 2nd tab are the upgrades)
It would be best for you to have a look at our wiki page which should explain most of the game to you without much reading
Hope this helps,
Cheers