Hi Everyone!
I am French currently in Thailand near Hat Yai on a visa exemption. I am intending to leave to Malaysia on the 19th Feb in order to renew my time here.
I was thinking of doing a visa run by going to Padang Besar and coming back right away to get the 45+30 visa exemption pass.
Would it work to just pass the border for a few minutes and come back with a new visa exemption pass?
Another option that I consider is to get a tourist visa or a long-term visa.
What is the longest tourist visa that you can currently get? And what/where/how would I have to do to get it?
Are there long-term visa options? 
I will start my online business sooner or later,  yet I wasn’t planning to register it in Thailand.
Later on I plan to be employed by a Yoga place: I suppose you first need to get the job paperwork before applying for the work visa?
Thank you for your help!
TLDR : Answer Summary
The user is currently in Thailand on a visa exemption and is planning a border run to Malaysia to renew their stay. They inquire about the possibility of quickly crossing the border and coming back for a new visa exemption pass, the longest tourist visa available, and the process for obtaining a work visa for future employment in Thailand. Comments clarify that a simple border run may no longer be valid and suggest alternative options like going to Langkawi or applying for a multiple entry tourist visa (METV). Additionally, the necessity of obtaining a work permit before working in Thailand for an online business or in a yoga position is emphasized.