I'm not sure that bike is worth sinking a whole lot of money into. You could get something light-years ahead in terms of function even if you went used for the money that you're going to spend to get this rideable--maybe. Additionally, that bike may not even be the right size bike for you.
If you go further, this will be a "learning bike" for you. Expect to be greatly frustrated when it doesn't work as you expected, after running into problem after unexpected problem.