Hello, Patches 
Ah flight, the most popular yet strangely difficult things to do in an LD. I think it all boils down to us being unable to cope with the fact that gravity doesn’t apply. One of the first time I tried the lower half of my body floated away without my upper half 
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Here’s a link to a whole bunch of different flying techniques you might want to give a go. If all else fails, finding a flying machine like a hoverboard or a jetpack can make things easier at first.
Now, extending your dream is quite a bit easier. My personal favorite tech is to rub your hands together. Even if your vision is completely blanked out, and you can even somewhat feel your RL body, as long as you hold on to that sensation you can get back into the dream. Another good one is either spinning or falling down backwards (don’t worry, it doesn’t hurt; you’re dreaming after all), and both of them can be combined with hand rubbing.