Though the Aqua Sharp has some features that may be difficult for a rank beginner to grasp, the manual explains them pretty well. It's not hard to learn.
This is a fairly broad questions, there are many different types and brands of what you're looking for, I would suggest visiting your local electronics and consulting with an expert.
This is a type of broad question to the point where you'll have to visit your local electronics store or contact expert about this. There are many types of brands.
