Basic Moves are your only friend if you still didn't learn any jutsu. But even if you did, you still need to use the basics:
Attack - users Strength level is the amount you damage your target
Defend - Defense level*2 is amount you reduce damage you take.(this automatically applies when you take damage.)
Evade - RR users Speed level. If result is more than half your opponents, you take no damage.
Rest - Gain the amount of users Jutsu Power/4 to your Chakra.
Equip - Equip a weapon or use an item in battle. You can also RR Speed, if result is more than 30 instant equip, which doesn't take a turn.