find out where you are and just add a lil tiny bit more to that, this way it's something you can do, succeed, and get that lil determined boost of confidence. then add a lil more. repeat.
I started really small. I bought a pedometer put it on and found out I only walk 750 steps a day. so I strive to beat that. I also joined a Spark Challenge that made sense to me 10 of activity. even I can do 10 mins of SOMETHING! it feels good to be meeting and exceeding my goals and keeps me coming back!
try a new veggie at least once a week, try it three different ways to get a good feel for it's different uses and tastes.
lil changes make a huge difference when they are all added up!