I, too, am a single mom (12 yr old boy) - AND I too have a Trikke!!!!! Personally, I would wait a LONG time before roller blading - try simpler forms of exercise like walking, biking, and swimming!
Yes - it can be a pain to cook for one - but you can do it!!! It's just for a while! I started working out with a trainer for a few weeks this summer, just to give me a kick start - and now I attend the fitness/boot camp at my church 3 nights a week! Great fun!
Crockpots are great - and I have a new toy - I fell victim to an infomercial and bought some time of counter top convection oven thing that will let me cook food directly from frozen in a short period of time! We'll see how that goes! :-) Just go for trial and error! Plan ahead and JOURNAL your food!!!! Good Luck! JoAnne in Texas