What are some tips for a few people trying to build something big in minecraft?

How would I plan it out is my biggest problem. Are there any apps for iphone or programs where I can make some blueprints? I'm playing minecraft on Xbox so world edit isn't an option

I would just draw it out on paper. You know, using X's as blocks.

example:

X X
XXX
X X

Just my thought. Hope I helped!

Just use paint and use rought outlines, you should get it for the PC WorldEdit is a dream come true

The best bet is to just start building. Things start to pan out when you start putting down a rough idea with just cobblestone or something. You can start with a frame for the building and build around it or start with a foundation or something of that sort.