just adopted a "picked on" beardie

[lizardo]

Hey im new here ive had a water dragon for about a year now and i just adopted a sick, im geussing about 2 year old beardie, and i love him he is missing a little bit of his snout but it is all healed over now, and his tail has a little missing other than that he seems allright, he only licks his greens he eats roches no problem and he has sort of a sticky clear liquid on his mouth any pointers for feeding greens and what is that clear liquid stuff, sorry about the long post anything will help. thanks, also he lived with 2 other beardies who were very healthy thats why i say he was picked on. thanks alot