Wow! Given the 2 mics you are considering, I hope you didn't buy a recorder designed for voice. Forget those 2. Mics are the most important part of the signal chain, given at least a decent recorder.
To get useful feedback from members here, you will need to tell us the digital recorder you bought and what your price range for mics is. If you do have a decent recorder, I'd recommend a Church Audio Mic and you'll probably need a battery box to power it (though a small preamp is even better). That could set you back $200 or more with shipping, unless you can buy used from the yardsale. You'd get the gear a lot faster buying used as well.
I don't record much in stadiums so I'll leave it to others to recommend whether you should use cardiods or omnis. They would need to know what the venue you'll be taping in is like and where you'll be sitting to give an informed answer.