http://bit.ly/1iQoTYS here is a good place to get a new microphone / charging port.
http://amzn.to/2gwN1Gp here is a premium tool kit in the $28 price range that I recommend that is very well put together and has most everything you need.
http://amzn.to/2fUOG4y here is a nice basic tool kit in the $12 price range that I recommend.
http://bit.ly/KJyeUI is a good place to check out iPhones if you are interested. This video is about changing the microphone/ charging port in the iPhone 4s. Check out my other repair videos for iPhone 4s. Thanks for watching!