New, slow, hopeful Traithlete in Las Vegas

Hello all!  My name is Dan and I've never been an athlete in my life.  I am now 47 years old, 413 lbs and 6'4" looking to complete the Pumpkinman Sprint Triathlon in Las Vegas this coming fall.  I have never done physical training for any sport so this is all very new to me.  A co-worker and friend of mine has been competing in sprint distance triathlons for over a year now and she has inspired me to give it a go.

I bought a bike about 5 weeks ago before I had this idea and I'm regretting my choice, but I'll have to live with it for now.  Its a Schwinn Landwark cruiser and not what you would call a "serious" bike.  It has gotten me riding though.  I started at one mile per day, five days a week and I'm already up to 8 miles per day.  I can see some progress!

I'm looking for inspiration and information on this site and have found a great deal already.

I look forward to "talking" to everyone here.