Hello everyone,
It's my first time posting here, so please be gentle 
My friend owns bearded dragons, and she was recently given another who doesn't get along with hers, and so she is giving it to me once I get my set up. Now, let me give you a little background on this little guy.
The people who had him before my friend bought him for their daughter, who ended up being terrified of him. The father was then in charge of looking after him, and he was only home 3 days out of the month, and the mother refused to look after him. All he was fed was crickets, nothing else for about a year or so.
Now, what our problem is now is trying to get him to eat something otehr than crickets. I don't have much experience which beardies, let alone ones with issues. Most of my expertise is geared towards snakes. I know the habitat requirements and the diet. My only concern is trying to switch him to a more diverse and nutritional diet. I know beardies are picky, hence why I'm asking you all 

