Youtube Music Player

Hey, I'm trying to make a widget so that my members can add the widget, copy and paste their Youtube link to the widget and have it play on their profile. (Kinda like this, http://tumblring.net/a-youtube-audio-player-for-tumblr/)

But the problem is, is that this will be my first plugin I've ever made and I'm trying to get used to how Elgg codes. Do pretty much I want to make it so there's a box so that they can copy and paste their link in and then a select box to either make it autoplay or not.

And yes i know docs.elgg.org/wiki/Plugin_development exist....