The first flight will probably an into flight.  You will do a walk around and then go for it.  After take off you will probably be doing most of the flying.
I have a little over 10 hours right now, just did my first solo and I have done very little class work.  It is expensive and time consuming though.  It will end up costing around 5 grand to get to 40 hours.
If I had it to do over I would have saved up like 3-5k and taken a 2 or 3 days off work each week for a month and just gotten it in a month.  Not flying for a month or two I forget a lot of shit.
I also remember looking on ebay or something and there are flight schools out there that charge 7,000 for a week.  They provide everything room and board, flight time, all inclusive 7k and you walk away with your PPL.  That is the way to do it.