He is very clear about about his interests in his letters (booys are ugly, girls over 12 are not interesting but young girls are) but there is no recorded evidence that he ever turned thoughts into actions.

There are more than three of his nudes preserved but I don't remember the exact number. He destroyed a lot of them himself as stated above.

A creepy guy without a doubt and he was forbidden to see Alice Liddel for unknown reasons (probably just for being creepy and visiting a lot).
His letters are interesting reading, and you can try some Sylvie and Bruno if you want to know what he wrote apart from the books about Alice (don't be surprised if you don't finish it, it's crap)