You should save and research a bit before you buy anything based on this comment alone. Use a recorder on your phone and then use either Audacity, Reaper or Garageband to understand how DAW's work and process of recording and mixing.

You will not find a pitch correction plug-in worth the bandwidth to download it based on your price point. They aren't plug and fix and actually take time to use effectively past the cranking the settings to get robovoice.

If you want to invest in gear that's great but make sure you aren't just wasting it when you will get the same result from the absolute bare bones. An SM57 is one of the most versatile mics you can buy for cheap and has been used on countless albums. The only other thing I could think of is a USB Yeti.