I'm sorry if this is a bit harsh but your post is lacking alot of the information it needs for a good reply, what kind of metal detector? what kind of lcd? and it seems like you haven't even tried to research this on your own.
What you are requesting is going to be a lot of work, programming microcontrollers may even be required for the lcd and like <snip> am I going to do all that for you!
Secondly you say you're a beginner at electronics but you are doing a "final project"? Why did you choose something you don't know anything about for your final project? Don't tell me you're doing an electronics course, got to the end and don't know anything because you slacked off the whole time.