I just one of the knockoff last week. I thought about sending it back, but it is a good cheap one for experimenting. It came with a little manual, apparently for some othe tablet. The touch screen is close to unusable with a finger. Plugging in a mouse made it a joy to use! Buy a cheap mouse, they will like each other. A stylus works okay too - I made a good one by flushing out a highlighter.
I have a few weeks of self-directed study. I've been designing and building embedded computers for a living; this is my first foray into android. I appreciate the comments.