>>33650895
First, you need to build your portfolio. Find a couple of doujins that haven't been translated (hitomi.la makes it easy to find new works), download it and run Google translation (or whatever MTL tool you want to use), then add the translated dialogue as well as a page with your contact info - you can be as fancy or basic as you want, but I recommend putting in some effort in since it makes you look a bit more professional. Upload them onto your site of choice (I recommend E-Hentai, Nhentai and Hitomi.la since those are pretty common mainstays). After that, just keep an eye out for new commissions - if work is slow, do another free translation to keep momentum going.
For best results, try to make yourself stand out from the crowd. Some translators, like Menospeaknihongo Productions, set themselves apart by adding humorous joke translation bits after the main story, while others go the extra mile and offer decensoring services (note that this requires a bit of artistic know-how, so if keep that in mind). If you can, try to find yourself a niche - whether it's what language you translate to (default is English but there are plenty of untapped markets for most other languages, and perverts exist globally) or the genre you specialize in (incest, NTR, loli, etc.), having your name known for providing quality translations for specific fetishes will help you get more commissions.