First one is simply a ball of compressed fire. Send it at any wave of water up to A-rank, to send it back at the opponent and pretty much send it back at them as super hot water. Or, do the hand seal and release it and make a wall of fire that flies at your opponent. So it's good against up to A-rank water, and up to F-rank wind!
Second one, focus chakra on 4 spots. 3 around the opponent, 1 in front of you. Send the orbs at your opponent, as many at a time as you want, but remember while the orbs are up, you can't use other jutsus, since it requires you to focus your chakra. You can send them at once and then use another technique.