i've never booked a hotel room before, well not before going there anyways. i have friends and relatives i go stay with instead. just look it up online, i'm thinking that booking it ahead of time with your flight will save you more money, but you'll get the 'foreign' rate. hahaha if you're looking for something cheap then you'll have to go find it yourself when you get there. which i suggest you don't do cause you could get ripped off if you don't have someone you trust speaking with you.
it's just basic common sense when traveling to a foreign country. i seriouslly suggest you don't go roaming around alone either, at least make sure you have friends that you're planning to meet with. not just security reasons but also it's weird for a girl to travel alone in thailand.