I've just been paid by my first client (yay!).My issue is, I'm still living on student grants and I'm not allowed to earn over a very small threshold, otherwise my student grants would be revoked (retroactive). Fortunately, only the net income (not revenue) is looked at once I hand in my taxes next year.I'm self-employeed as a freelancer (in Germany) and can write off a lot of things as business expenses.The legal details aside - just assume the general expenses can be written off – what would you recommend me to invest in, to establish my business, grow my personal brand and get more clients in the future?