Few tips
Turn off augmented reality if you want to try save battery as this game is a drain, expect to use around 30mb data usage for a good 5 hours constant gameplay, don't waste your candies and stardust on leveling up your weak pokemon, only level up fully evolved pokemon, and only evolve your highest rated duplicate as it gives it a bigger boost than wasting evolves on weaker ones. Transfer duplicates to the prof for extra candys for evolving.
Pokeballs and revives and health potions are plentiful , dont bother trying to conserve them feel free to use them liberally, i would not recommend using incence to attract pokemon to your location as the servers are unreliable currently and you dont want to waste them, however, you can earn them by leveling up so if you think the servers are smooth and want to risk it feel free.
Visit all the local pokestops every 5 mins for free pokeballs potions etc, and take controll of gyms lvl5+ in order to get freebies if you manage to hold them and add help allied gyms by training them and adding pokemon to expand your teams territory
I suggest you guys invest in a portable battery pack lol, because you will need it. Any more questions feel free to pm me.