Ok so I got this bow from afriend, any information on it would be greatly appreciated. I had a few direct questions about it.

What do I need to make this bow functional?
What would such a long bow be used for?
How much is it worth?
What size arrows do I need?
Is it worth trying to use or should I just hang it up?

Thanks I'm fairly new to bows so really any help is appreciated, I plan on checking out some other threads but if you have any good places to start that would be great.