Need Some Help!

Could anyone give me some tips how to create heavy, experimental but yet melodic kind of sounds?

Kinda hard to explain, but I'm in a band, and none of us really knows much about music/theory and such. Our biggest influense is maybe Cult of Luna, a swedish rock/experimental/metal..ish kind of band
http://www.youtube.com/watch?v=OSxIRU1BJo8

So, what I'm asking is really, how would you start construct melodies? which scales are most suited for that kind of music? and maybe more importantly, how can I construct a chord progression from a certain scale? argh, so many questions I'm a newbie musician I know
I've been trying to read some theory, but it's so hard to understand it.. :/

Any help would be appriciated!

How To Switch Boxes In A Scale

For example, I know how to play the boxes in the pentatonic scales pretty much upside down.
But just playing box by box feels kinda limited, and when I try to move around I keep forgetting the other notes in the other boxes.

So, does anyone got any tips? maybe some lesson to help me memorize better?

I know I'll learn it eventually, but any help learning it faster would be much appriciated!

New Ibanez! :)

just ordered an Ibanez RG2550Z

I got really high hopes on this one, from what i've read it's suppose to be a great guitar.. plus it's so good looking