Best bet is book a hotel then you can just get on a plane and then you will get a 30 day holiday and then you can go to immigration and they will give you 30 days more, you can cancel the hotel and go to your condo, when you go to the immigration you can also ask about your condo ie the information you have to send to apply for your holiday in the condo
If your going to Bangkok immigration office then you will need to take your bank book and the letter from your bank confirming that you have not dropped the money below the
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I had to do it yourself, I was not happy with the immigration because they don't tell you until the day you arrive
Frist thing is finding out what is the best visa for you, then come to see bkk and how everything works out with immigration and the schools in Thailand for the kids as its very expensive for a good school here, it's ok to asking people on here but I think that it's much better for you to come over and stay for a few months frist. As what you may find that you don't like the same place as some other people recommend
your best bet is to Google, but you can just walk into the bank and ask if you have any thai friends then please take them with you as its much easier for the thai bank to speak with your thai friends to help you