My best guests are: They get it from the merchandise they sell (Jerseys, balls, hats etc.) The government gives them money depending on how popular the city is.

Ticket fees to see match. Merchandise and TV FEES from Sky.BT and bbc. Itv

The bleed punters who don't know any better dry.

Match day attendance, merchandising, tv deals, sponsorship (like sponsors name on shirts shorts, etc). Government funding maybe for the national team but that would be it.