I have been playing airsoft for the last couple of years, and I have picked up some pretty good strategies I will share with you.
Thing you will need
mask (highly recommended)
and a field to play in
smoke bombs (optional)
airsoft grenades (optional)
and to go the extra mile you can even make a airsoft grenades and smoke bombs.
Step 1: Field
I myself built bunkers out of fallen trees and old trash that was in the field that I play in
to build foxholes all you will need is a shovel, all you have to do is dig holes three feet deep and three feet wide. That you can sit in to hide from enemy fire and you can even build trenches to connect the foxholes