Some good advice here. I would second the advice to get a medical as early as possible, I'd say trial lesson first to make sure you actually enjoy flying, then medical as soon as possible so you don't waste loads of money on flying only to find some obscure medical result prevents you progressing.
My main piece of advice to people very new to aviation is NEVER PAY UPFRONT FOR A PPL COURSE. Some schools make this look very attractive, offering discounts for buying hours in bulk, but it could take you over a year to fly these hours, and if the school runs into financial trouble in that time, and you lose everything. It has happened to a lot of people in the past, so make sure it doesn't happen to you.
So NEVER PAY UP FRONT, and hope you enjoy the flying.