Cannon Creation
To create a cannon, place a block of your choice (Lapis by default, changable in config.yml) then beneath it place a sign with "[cannon]" on the top line, followed by the X and Z co-ordinates on lines 2 and 3 respectively. The coordinates support decimal point values, for accuracy. Permissions node for creation is "launchme.cannon".
Landing Pad Creation
To create a landing pad to negate any fall damage, simply place a block, gold by default but changeable, down and place a sign beneath saying "[land]". It couldn't be simpler! Permissions node for creation is "launchme.land".
Teleporter Creation
Very similar to Cannons, simply place a block, default lapis, but changeable, down with a sign with "[teleport]" on the top line. Lines 2, 3 and 4 are the X, Y and Z coordinates to teleport to, respectively. Coordinates include decimal point support. Permissions node for creation is "launchme.teleporter".