Welcome and good luck with you goals! Make a commitment to tracking everything you eat. If you can stick with that, it will really help! Set Fast Break goals (and other goals), join SparkTeams, start a blog on your SparkPage. All of these things will get you involved in the community to keep you motivated and accountable.
For starting out, remember that small changes can go a long way. Just cutting out soda should make a huge impact for you, especially if you are only replacing those calories with water! Consider joining the 10-minute exercise streak challenge (you can find this on the Challenge Central page until the Community tab). I found that when I first started, this challenge was very helpful in getting me used to working out and teaching me that I do have time for it!