Hi Spencer
The blisters could be due to a number of things... socks, shoes (size or design), running style... do you wear proper running socks? They are pricey but are worth it.
To find your local running shop you could simply google 'running shops + where you live'
You can pay anything from £60 to £100 for a good pair of runners, but don't be sold up to spending more than you need. You should have a proper gait analysis by someone who knows what they are doing and who are going to sell you the correct shoe for your running style and fit.
Without knowing what or how much training you are actually doing I can't make any further suggestions on other exercise etc
Sounds to me like you're doing great though, if you've done a 5K that you are pleased with
