Purchased the house as-is & found out there are water damages

[Lydia Kay]

I've recently purchased my first primary house as-is in Virginia and found out that there are multiple water damages through out the house, including floor joists (4~7 front part of floor joists) and a beam at the front of the house (the front of the house is leveled downward and the gutter was placed so that it would create a puddle of water when it rains. All overflowed water leaked to the house), and load bearing wall beam where they have added the extension den. We were not aware of these issues when we purchased the house.

How much would fixing floor joists and beam would cost? and what would be the best way to fix these? 

Is there any other things I could do other than making this a lesson for the future and pay for fixing myself and moving on?

This house is built on 1950s and I'm seeing so many problems. All these issues are too much for me to handle and I'm strongly considering putting this on the market once I fix the major problems I found. I'm already doing updating all the electrical work through out the house.