if you mean what stereo-system to use then AB or a baffle-system might be a good idea. Two very important issues in field recording are wind and handling noise. If you have some kind of a zeppelin/ blimp then that would make a small AB-setup possible and also cure those 2 problems.
The width between the mics you need depends on the source you are recording, just listen through headphones and move the mics apart until it start sounding "right".
You can also build your own windscreen on a budget, something like this:
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