Here we go - I won't try and explain everything in one post... I'll try and answer questions as we go along.
Firstly - Aside from soccer, there are three major football codes in Australia - Rugby League, Rugby Union, and Australian Rules football.
Rugby League and Rugby Union are similar games, and are most popular in the North East of the country (the states of New South Wales and Queensland) - they are played in other countries of the world - New Zealand, England, and South Africa most notably. They are played on a rectangle field, like grid iron, and you score through 'tries' in much the same way as touchdowns are scored in gridiron, although the ball must be placed onto the ground (not dropped) once the attacking player is over the line. In both codes of rugby, the ball can only be passed backwards. The main thing that seperates the two types of rugby are tackles. In rugby league, each attacking side is limited to six tackles - once they've been held up six times, the ball changes sides. In Union, there is no tackle limit. 'Scrums' are used in both games.
That's about the extent to which I can explain Rugby. My specialty, coming form Victoria (state in the south east of Australia), is Australian Rules football, which is about the only football game in the world played on an oval shaped playing field (like cricket), and an oval ball similar to a rugby ball is used.
At each end of the oval are sets of goal posts. There are four goal posts at each end - two tall ones in the middle, with shorter ones on the outside - something like this i I I i. To score a goal, an attacking player must kick the ball between the two large posts - six points.
If the ball comes off a defending player, or comes off a different part of the attackers (ie, the hand), only 1 point is scored. If the ball hits the posts, or goes between a large post and a small post, only one point is scored.
So simply, you kick the ball between the posts, and depending on where it goes, you get one point, or six points if you are accurate.
The ball is allowed to be carried, but must be bounced roughly every ten metres. To dispose of a ball, a player can either kick the ball (a drop punt) or handball, which means punching the ball with one hand out of the other.
Throwing the ball gives the other team a free kick. Running too far with the ball gives the other team a free kick. Being tackled with the ball, if you have had 'prior oppurtunity' to get rid of the ball, gives the other team a free kick.
You may only tackle a player with the ball, between the shoulders and the knees. Below that is a trip, and above that is too high. You may not tackle a player from directly behind... doing so is called 'in the back', and results in a free kick. However, shepherding (blocking or bumping) with your body (torso) against ANY player within five metres of the ball is allowed, as long as the contact is below the shoulders.
As far as specific rules are concerned, the only other thing of note is called 'the mark'. A ball that has been kicked, providing it is caught on the full (ie, not hit the ground or touched another player), is called a mark. A mark essentially gives the marking player a free kick - they are allowed to kcik without the pressure of being tackled. They can either pass it off, or have a shot at goal if they are close enough.
Each team has eighteen players on the field at once, and may rotate through the four substitutions on the interchange bench (thus any given side will use 22 players).
On the field, the brakdown of players is usually this
6 Defenders consisting of two back pockets, a full back, a centre half back, and two back flankers
3 Centres consisting of two wingmen and a centre
6 Fowards consisting of two foward pockets, a full foward, a centre half foward, and two foward flankers.
3 On ballers consisting of the Ruck, the Rover, and the Ruck Rovers (these guys just run anywhere they like).
The Ruck is usually the tallest player in the side, whose job is to win the 'tap outs' at stoppages in the game - the beginning of a quarter, to resume play after a goal, and when the ball is thrown in by the umpire if it has bounced out of play.
Ok, confused? Post questions below
Also, is there any way to post pictures here?