Alright, an introduction post is pretty important and both players have different roles (usually.)
Player one arrives first and posts first, they cannot (usually, unless agreed upon) see any sign of their opponent so as to give them free reign of where they start. In their post they tend to set the scene, describe landmarks etc. Most importantly they describe where their character is (roughly, usually this is cemented by the second poster's position and post) and what they're doing there. Then, you must try to inform any readers of how your character is equipped, some people are particularly strict on this and require everything to be mentioned otherwise it's considered void. This is pretty difficult when you have a very well equipped character, however, those sort of characters are also usually fairly tactically minded. So a trick I like to use is having my character mentally run through his more nitty-gritty equipment, while things like clothing and outward apparel I describe while describing the scene.
An example of this trick I saw (which I attempt to utilize) is to describe the scene and part of your character's apparel simultaneously, so as to not bore readers with a description of everything they are wearing in a list-like fashion. For example -
John stomped his way down the long dry road, his tough black boots kicking up dirt and dust that began to mar his otherwise fine looking jeans.
So, you have an important check-list in (any) introduction.
Describe the scene (as your character perceives it or not is up to you.)
Explain your presence.
Describe your character.
Describe your character's equipment.
The first poster has the lion's share of the work in describing the scene, consequently the second poster is responsible for initiating dialogue or at the very least bringing the characters into contact, as they start with knowledge of where the other player is. This doesn't necessarily mean literally walking up and talking though, if you wish to utilize stealth you may, but you may say something along the lines of your character spotting the opponent and moving closer.
Some rules and tips for introductions:
Combat can't be initiated in an introductory post.
'Prepping' an attack can't be initiated in introductions. (This is part of T1, which I believe you said you read up on.)
Forgetting important details in an introduction is a critical error and should be avoided if at all possible, or judges may rule against you.
Introducing the scene is an important role, don't take too many liberties with the environment however or you may be judged against. For example, planting yourself in the middle of an icy lake on the one platform available in miles is bad form. Someone used this against me in a tournament once, very cheap tactic.
Finally, have fun with it, an introduction can stretch way into the past if it helps explain your character's presence and can grant a greater gravitas to a fight.
