You can't imagine what a broad question you asked. What is the leak and what do you have?
Depends on where it is leaking.
use leak stop or something. Where is your oil leak?
We are going to need to know where the source of the leak is to help you with that question.
depends on where the oil leak is at
you fix the leak
Depends entirely where the leak is coming from.
An oil leak problem probably is the sign of a problem in your oil pressure or it could simply be a slow leak. The problem can cost anywhere from $100.00 to $400.00 for an oil pressure problem.
Loosing this much oil in such a short period of time, there should be obvious leaks. If you see none, then it is probably burning the oil, and not leaking.
Depends on where the leak is and how much you are willing to spend. Best thing is to take it to a reputable shop and get a written estimate on what needs to be fixed.
tape
It will continue to leak oil and if you do not add oil regularly it will eventually cause engine damage.