We have plans for a leaderboard, one that will be viewable in game as well as on the upcomming new release of MyUO. We ran into some technical issues with implementing it in game so it won't be included in the initial release of VvV. It tracks a variety of stats.
Sigils are part of winning the battle, they offer the most points of any of the points generating activities.
Battle readiness is a measure of your war horse (or ostards) fitness for battle. You can increase the battle readiness of your war steed by feeding them Essence of Courage. Each essence of courage you feed your steed will increase its battle readiness by 1 unit. It decreases at a rate of 1 unit per day of in game usage (every 24 hours you have it in game), as well as 1 unit every time the steed dies. When the message is given to the player that the steed's battle readiness is "dangerously low" you have 5 units of battle readiness left.
Capturing an altar awards points towards winning a battle, 500. Each time an altar is own, there's a 2 minute cooldown before the next altar is activated. There is no limit to how many times an altar can be activated during a match. Until a team fills the score bar or the timer runs out, the altars will cycle through.