One option could be certain file-sharing websites, but be careful as not all of them are legal or safe. Another possibility is to search on dedicated manga download platforms, but make sure they are authorized to distribute the content.
There are a few websites that offer manga raws, but be careful as some of them might be illegal or have poor quality. One option could be MangaRawz, but make sure to check the legality and reliability.
You need to have a good understanding of both the source and target languages. Also, familiarize yourself with manga-specific terms and cultural references.