Register a KvK and legally freelance for about 85 eur
One one-time fee turns you into a legal business that can invoice Dutch clients immediately - no minimum capital, no notary, no accountant to start. Prepare the eenmanszaak registration online with DigiD, then a short in-person KvK appointment; you get a KvK number and usually a VAT number fast. Cost: 85.15 eur one-time (tax-deductible). You then owe quarterly VAT returns unless you use the small-business scheme (KOR), and income tax on profit. Your permit must allow self-employment.
EUR 85
Get the rest of it, in your own language.
MAS reads your IND letter, checks whether an employer can legally sponsor you, and finds work that will actually take you. Free, no account.