I, too, an a single woman who owns a home in The Villages. Don't worry, you will get your answers, you just have to give it some time. That little camera looking thing on the side of the roof is a rain sensor for your irrigation. It fills with water when it rains and stops your irrigation from operating when moisture is present. As for cleaning the dryer vent, just call Desmond Harris at 352-308-9243. He does a great job and the cost is very reasonable. If you provide the 9 volt batteries, he will change the batteries in all your smoke alarms, irrigation back-up battery, and anything else that needs a battery changed.
Make friends with your neighbors. They may be able to answer all of your questions.
As always, just ask your question here and I am sure you will get plenty of answers.
You might want to keep a notebook of names and numbers of contractors you hire to help you around the house. The first person in my notebook in my handyman. When I first bought, I felt like he was becoming my new best friend!