How to start making money?

I'm Arsenal, and when you start they're making a good amount of money. Except I went and spent it all and now we're in the red. Not by too much, but enough for me to think I need to stop buying players.

I've got a decent squad, one that doesn't need strengthening too much (although I've got Lewandowski coming on a free in the summer! Tried for Alonso as well but my wages are all gone, as is the transfer budget!)

I've also got a young squad, so it's future proof as well. So how do I start getting the clubs finances in place? When I get my next transfer budget I'm going to put most of it into wages, since I'm paying quite highly at the moment. League and UCL winners doesn't come cheap, all my players wanted rises and I'm making Lewandowksi my highest paid players on £125k a week! Couldn't let him go anywhere else for free!

So with my wages being paid for via the budget, I don't have anyone left to sell as I want to keep what I've got and I get 100% for transfers anyway. How do I now start making money? Request a club in another country? What else is there other than that?

Obviously spending better, which I will be doing. But wages will remain high.