Hi Kalishea and
You have got some great advice on here already, but I thought I would add my two cents.
With regards to the monthly minutes goal, I essentially did the same thing as Naveah. In the end I came up with 1000 minutes as a starting point. I didn't reach it last month so I set the same goal for this month and I am half way there and am now try to pass my goal.
I find the exercise minutes goal is a great challenge and competing with the ladies on this board is my motivation. I never realised I had this competitive edge before. Other people don't count minutes but set a target to complete, say, 3 sessions of cardio, 2 sessions of weights and 1 session of yoga.
As for nutrition, I started off counting calories and working out all the math involved but i start to get discouraged and over analyse too much. I have since decided to watch the fat content and keep myself under 30g per day, try to take in only unprocessed foods if possible, ie, multigrain bread instead of white bread, and watch the sugar and calorie contents of foods.
You can achieve your 15lb loss and I suggest you just take it one day at a time. You will find most people will attest that the last 15-20lbs are the hardest to lose as your body wants to hold onto it.
If you want some suggestions on books, websites, etc, send me a PM. More than happy to help.
Feel free to jump in on the last 2 weeks of our May minutes challenge. Set yourself a goal today and join in.