Help setting up

I just started the whole dolphin experience and for the most part I'm happy with what I see. I have gotten most settings done for myself but some others I'm having a hard time figuring out. First off I get an error saying that when I open dolphin it couldn't load the opengl plugin for directx. Also when I get the game running the base textures like the ground go either black or weird colors with stripes in it. And also I'm having a hard time getting my x360 controller AND my keyboard working. I tried using both plugins and nJoy is the only one that lets me assign buttons for my xbox 360 controller but it doesn't let me assign for my keyboard. Can someone help me out a lil bit? The game I'm trying to play is Super Smash Bros Melee.