firstly do you mind not posting such a large file. 1000pixels is ample.
to photo the moon you need a good long telephoto lens.
I do not advise you photograph the sun at this stage as eyesight is important for photography and you can ruin your sensors if you don't do it properly. Research it.
Lastly well done for having the balls to post your picture as your are right it isn't a very good one. But we are all here to learn, so keep practising reading books, watching the video tutorials and get out there and take photos as that is the best way to improve.