How to get inverting amp in an electronics project with 1 battery
Op amps need a dual supply to operate. If you are working from a single supply, you can create an "artificial ground" like this: 



You can then use this mid-rail "ground" (which draws very little DC current but has a low impedance to the real power rails because of the capacitor) to bias your opamp (the + input) and also to reference your input signal. Because of this there is a DC block capacitor at the input.

You don't say what kind of mic you use - if it is a dynamic type they like to see an impedance of about 2k, hence the 2k2 input resistor. The gain can be set with the feedback resistor - here we have 22k which gives 20dB. A small cap across that resistor would also be a good idea for stability.

(Note that if you are using an electret mic, this won't work - they need a power supply of a few volts. Also, with this circuit, you will get a nasty "pop" at power up because charge current flows through the mic - not great for it. It might be better to move the mic ground connection to "fake ground" - but that depends on how other things are grounded too. Experiment.)

(If you have a spare opamp section, you can use it as a unity gain buffer to improve your "virtual ground". There is also an IC made for the purpose, the TLE2426, which does a good  job.)