The Thai government has been considering its own escrow legislature for a long time with a view to making it more readily available and more like other countries.
There are many places online to advertise your real estate for sale for free. This site is one of them, but there are many more and also many places online in social media.
Key Money (not to be confused with 'Tea Money'), exists in several countries - Thailand, Pakistan, Japan, Korea, France, Sweden, USA, and up until 2003, Australia. Although the name is common in these countries (except Pakistan where it is referred to as paghri and Japan where it is known as reikin), the meaning is different.
Everyone has an idea about how they want to approach buying a business. After all, buying a business is a big decision, and is not generally something you do on a whim. But there are at least two parties involved - buyer and seller, and often a broker.