Next, you might want to prepare money for your trip. The currency used in Bangkok is the Thai Baht. The following are the latest rates in the last 24 hours.
While traveling independently provides freedom, using a tour operator provides convenience and comfort, not to mention the opportunity to experience things that have been pre-arranged for you. A tour provider that I could recommend is Exotissimo Travel.
Finally, you might want to view some of travel books to give you more knowledge of Bangkok ahead of your visit. Here are some books you can get directly from Amazon.