Hey there, welcome aboard!
You are asking pretty general things, so I would suggest that you take an hour or so (you will need it) and just read the articles found in this thread HERE. This is a collection of things you need to know and helpful hints and tips.
It was those articles in that thread that taught me what I know and have got me to where I am in my weight loss journey.
I hope that helps, and any specific questions, there are tons of helpful people that will give you some answers.
Good luck
