Do I need to include a bank statement for my first tourist visa application for Thailand from Penang?

Quick question about getting a tourist visa for Thailand! I’ll be applying for one in Penang, it will be my first time getting a tourist visa, however I have been in Thailand for a few months already just using my passport. I’ve looked up all the requirements for that visa, and was wondering if anyone knows if you need to have the bank statement on your fist application or not? If so, how far back does it need to go? Or does it just need to show the current balance?! Also, if you get an invitation letter instead of accommodation booking, what all does that letter need to say! Thanks!!