Download a Developer Program such as Eclipse copy and paste that text into a new project and customize the messages, and then extract it and then put it into your plugin folder.
The "Developer programs" that you talk about are called IDEs The Class BukkitRunnable should work for you Code (Text): new BukkitRunable(){ @Override Public void run(){ //Run this code later } }.runTaskLater(JavaPlugin, ticks); Ticks being the number of seconds later multiplied by 20