First, congratulations on beginning your weight loss journey!!!! That is awesome!
In terms of exercise- I would say that walking 2.5 miles is an excellent start! Cardio is the best way to lose excess fat and weight training is the best way to tone and build up muscle that allow your body to continuously burn. They compliment each other.
Keep in mind though, as Jillian Michaels says, try not to strength train the same muscle group within the same 48 hours. Basically, after you focus on one muscle group during one workout, wait two days before you train it again. This will allow the muscle to heal and build.
I would suggest (as per something I heard Bob Harper once say), after a week or two of walking 2.5 miles, try a slow jog of the first mile. Do that for a week. The next week try beating your time for that mile. Then after you can comfortably run that first mile, try slow jogging two miles.
I don't really know about other websites that tell you what to do and when. I mean, I guess if you are looking for general strength exercises and want someone to show you how to do them, I would go to Self Magazine's website. I don't do a ton of strength training beyond a few exercises I found there. In terms of cardio, try to find something you love to do. If you find an activity you love, you will be more likely to stick with it and put more energy into it!
Good luck! You totally can do this!!!!