One of the most important do's IMO is ...
Allowing enough time to have your work done comfortably, for both you and your dentist. Problems occur when a client says ' I need ten crowns, can you do it in a week?' Your average Philippine,Thia, or wherever dentist will say yes we can. And why not, medical tourism is a lucrative business. But, his vision of this five days will be a lot different to yours. How much time are you allowing to spend in the chair each day. Depending on the amount of additional work(fillings,periodontal issues, rootcanals) required, your crowns can take up to 6 hours a day.
My other concern is with that sort of time line your dentist would also feel the pressure. Mistakes can and do occur if things are rushed.
Ask a dentist at home if they would do your ten crowns in five days.
You should try and allow a minimum of two weeks for even basic cosmetic work. That is fourteen working days.
Do make an informed decision when assessing the idea of having your dental work done oversea's. Do your own research (as you are doing now) and not react to the first person who says "aaagghh! don't go over there!, your teeth will all fall out!, you'll be kidnapped!, infected!, robbed!". Everything I heard when I told family and friends I was going to the Philippines for my own dental work. But for my mind, they never understood. They all had good teeth.
Do make an informed decision regarding prices. If you are looking for the cheapest quote you're most likely to get the cheapest dentist. I see a few clinic's now advertising crowns for the same price we buy the legitimate materials. Please draw your own conclusions as I have ranted about the use of Chinese made copies in other parts of the website site and forum.
Don't hold back if you decide you don't like the appearance of your new smile. But do so before the final cementing of your crowns or veneers. If you would like your central incisors a little longer then tell your dentist. If the bite feels uneven or uncomfortable then let your dentist know.
Do allow at least one days trial of your cosmentic work to assess appearance and comfort. It can take a while to get used to a new smile. It can also change the appearance dramatically.
Do expect a lisp if you have had positional changes of your front teeth. Your tongue now needs to learn where to go for the correct pronouncement of letters. A few days to weeks will sort that out. Try to plan around public speaking.

For security sake do let your bank now if you decide to travel for dental and use a credit card to pay for treatment. For convenience also find out which local banks have ATM's compatable to your card.
I will keep adding to this list. Hopefully it will be helpful.
Feel free to message me with any questions anytime.
David