Depends where you are from but most western countries you will get a visa exemption for 60 days. You can apply at immigration for an extension of another 30 days on that.
Keep in mind; meeting Thai women on the internet, while not immediately a scam, it’s highly likely you will get taken advantage of financially so just have fun but don’t get too carried away.
There is no sick buffalo. If a relative is sick and needs medical bills paid, suggest to take your lady friend to to visit the sick family member and pay directly to the hospital. Etc etc etc
I’m not the authority, but I’m sure you could easily just say author.
I’m actually pretty sure you could get it with photographer too, but I would be generic and broad with the description and not specific that it’s to do with it based in Thailand