Hi,
Browse op amp parametric search tables on manufacturer's websites, look for op amps that handle inputs down to 0V and that have input offset voltages lower than the signal you want to capture, be aware that a bandwidth of 1 MHz usually means 10 kHz max. in reality.
Also, look for application notes about how to understand op amp datasheets and parameters.
Have a look at the difference between voltge feedback amplifiers and current feedback amplifiers.
You have a lot of reading to do, I'm afraid, give yourself maybe a week to research op amps and get an understanding of them for your needs, good luck.