Yes, but it's not quite finished yet - take a look at

http://thailanguagewiki.com

I think the first few chapters are done and the rest should be up by the time you're through that. The audio is still being added, so please be patient, but this will be an excellent resource when its complete.

Do you mean which is grammatically correct? The correct structure in English is "I believe in God", which means "I have faith that a being called 'God' exists."

This is rather a philosophical rather than linguistic question. The best answer to it is probably to read Aristotle's book called 'The Nicomachean Ethics' (you will certainly be able to find a translation in Chinese). My own short answer would be something like 'happiness is finding something to value in your life that is more important to you than yourself, and then using all your power and resources to nurture it and make it grow.' That 'something' could be your children, your family, your career, your dream, your lover, friends or a combination of all these things. One thing it would NOT be for me would be money, except insofar as I need money to help promote the well-being of those I love.

I'm not sure how 'Line' is pronounced - if it is like the English name Lynn, Lyn, Lynne, then Pete's answer is correct, tho' it will be pronounced by Thais with a rising tone at the end with the spelling หลิน. If you want it pronounced without a tone, spell it as ลิน If your name is pronounced the same as the English word 'Line' (and the same as the last syllable in 'Caroline' you need a different spelling. There are several ways to do it, ไลน์ or ใลน์ or ลัยน์ or ลายน์ should all work.

'at' for schools, colleges, and universities 'in' for towns, cities and countries e.g. "I studied at the University of the West of England in Bristol." OR "I studied in Bristol at the University of the West of England." Also, use 'in' to name subject areas after telling the level of course, but no preposition after 'study': "I did a degree in Philosophy." "I'm taking a masters in Philosophy." "I got an A-level in Physics." But "I studied Philosophy." "I am studying Philosophy". "I studied A-level Physics."