This is my very first poster. I'm going to tell you 10 important points you must atleat try to follow.
1. structure; you half to cosider your elements, and where they are placed.

2.Contrasting colors; your poster should have contrasting colors that don't blend together, because you want some parts of the poster to standout, and ketch peoples attention, and always make it stand out from the background.

3.Less is more;Don't use ennecessary designss or text, mainly stay focused on your messege, and guide , that leads to a desired conclusion. The best posters us fewer then 10 words (which mine obviously has more then 10 and sucks big time XP) and one (If any) image. There is no need to over do your poster with unecessary elements.

4.The bigger the poster, the bigger the attraction; graphic elements and poster text, should be larg in dimenshion. Its also important that people can read it from afare, and readible.

5. Be imaginative!; An ease way to leave an impresion is to us something totally pout of the box, or something not common, or even better, something totally realisticly posible, like a baby playing with an elephant. Our make things humoris with faces or actions. Don't over exsagerate things that it will then confuse people from your messege.

6. Drive a responce; Your poster has to be able to call people to action. You have gto jse your design skills to pull people in. You want them to call, or visit a web site, or make changes to there lives. You'll have to show it all in your poster design.

7. Typography; You should visually mach the poster style with an image that uses pure fonts.

8.Language/Signs/ Symbols; You must give people a visual understanding of the poster, also if it has a log that goes with it you must make sure it all works with the other things in your poster, because you can't just throwe in things without even thinking you know, because it can throwe every thing off balance.

9.Space (emphasis); Provide space within your poster so that key elements can standed out more with everything else with it, also so things don't get all smushed together, and hurt peoples eyes.

10. Print support; what is used to print your poster will depend on its quality. With glossy paper, it stands out with a stonge shine to it, but its exspensive, or cavas, which is also exspencive, but gives an old cfashioned feel if thats what your aiming for, and normal paper, nice and cheap, and you can stain it or what ever you wish without payiong alot.

well there are 10 points, there are more, but hey, I'm not going to bore you anymore then i have, so check you later, Bloody Moon.