I'm in the same boat as you, just started off a bit bigger lol. I'm 27, and was just over 300lbs, my wife and I joined Just Fitness 4U in Marietta in June, and I'm down about 30lbs now. I'm sure you're gym offers the same type of stuff, we see a training once a week for $70 and she is well worth the money. She gives us all kinds of advice on fitness, diet, etc, and she whoops are as 30 mins every Thursday. Plus they have competitions for most weight loss and stuff like that. My advice would be do as much cardio as you can, I had really high blood pressure too and doing 10 mins on the tread mill used to have me about ready to pass out, but you just build up. Now I'm able to do an hour of run/walk without feeling like I'm going to die lol. Cardio is definitely what you need to focus on for weight loss, and some weight training, but cardio is vital. Best of luck to you.