Brand newbie signed up to run Cleveland OH Sprint

Hi,

 My name is Mark Nelson and I committed to running a sprint in August.  I am married to a marathon runner and we are complete opposites.(she is fit and I am fat).  I decided to start working out in February after an embarassing event happened. I was getting ready to hop in the hot tub with friends, and my 8 year old god-daughter looked at me and announced"Uncle Mark has boobies". She is not the quiet type, so everyone heard and we all had a great big laugh.(well they all did).  At 5'7, 220 lbs, I knew that I was at least 30 lbs overweight for my body type, but it took an honest little girl to make me do something about it. 

I was athletic in high school and have always been a good swimmer, but have not done distance.  So, I joined the local gym/fitness center which is amazing becauseit has everything, Olympic indoor pool, indoor track, racquetball(my favorite), weights, and many treadmills, ellipticals, and bikes.  They also have the spinning classes which I have been doing.  Wow those are a tough workout. Everything I need to train is there, so I have no excuses.  I downloaded and started the 2X 20 week training program on Monday.  So far, so good, but I need to learn to follow it and not push myself to do more.  I am so excited about this sprint, I want to work out every day, but I am following the plan.  

Any advice for a brand new wanna be would be greatly appreciated.

 Thanks,

Mark