- dark soy sauce (used mostly for cooking)
- light soy sauce (used mostly as a condiment)
- ginger (fresh)
- garlic (fresh)
- lime
- red chilli (chilli flakes can be useful as a reserve)
- lemongrass
- palm sugar
- stock cubes
- fish sauce
- oyster sauce
- salt + pepper
- sesame oil
- sunflower/vegetable oil
- star anise
- rice vinegar/white wine
If you are unsure of what these products are or look like, check out Thai Food Online, which has a comprehensive guide to ingredients that you can also by, or ImportFood.com, which does good recipes as well as being an online supermarket.
Don't forget you will also need a good wok, and a lot of chopsticks!