Why you need an agency ....simple process at DLT.

Hundreds at the airport , or download the Grab App - much better

That's why Lazada is there and Shoppee

To be fair, this is a FB group and not an official advice service . You get the good, not so good and downright dumb answers. Roll with it

Residence certificate valid for a month(28 days). So can get anytime to avoid last minute. Maybe misunderstanding your Q though

Vietname and Myamar tricky. Need official guide and Myanmar land border only open to Thais / Burmese I believe . Rest Ok, as long as bike is yours and paperwork ready

You mean the 800k THB......?

Hopefully

Rubbish. No fixed rule, as long as you come and go and stick to the rules and don't overstay you ok. They may ask why you keep coming back and have a plausible answer. I used to come every weekend from HKG, and never got refused and asked a few times why, explained and never an issue

Tourist visa with you as sponsor. Dead easy , as long as you follow all the rules my girlfriend got her first go as we provided all info in detail.

Reasons for her to return - land and business

Evidence of relationship for last 3 years - used holiday pics

My financial position to support

Snowed em under with paperwork and evidence and worked a treat. 2nd and onward visa haven't been an issue and no longer need extra paperwork