Sure you will be allowed on the course in Bangkok. Half of players on the course in Thailand don't have any handicap!
There are rental clubs available at most courses, but i would recommend bringing your own. Rental clubs bite in Thailand pretty much!
A great course for beginners is The Vintage Club about 20km outside Bangkok towards Chonburi. Great wide open fairways inviting your driver, forgiving rough and just enough water to keep things interesting.
I'm in Bangkok half the time and would invite you to join as i try to play 2 or 3 times a week, but alas i am back in Singapore this coming National Day weekend.