Single Permit Registration

Can anyone in here help me figure out what documents I need for the 8 day registration at municipality after arriving to Belgium? I have a Visa D, and a single permit (B34) attached to said visa. Am seeing conflicting things about if I am coming to work, I need proof of sufficient means/birth certificate/ etc. Or if I just need to have my passport, visa, and the contract for my rental place? Thank you in advance for any advice you have!