Creating a battle manga

So, I was planning to do a battle manga, then I need someone teach me how to do a rough sketch of it....Just creating a one shot first....about how many pages.....well....I don't know...=-=''



but I'll find some reference. The story...still doesn't know yet, but I have the character ready...

the scenery and background....more like alternate world or something....>->

So, ummmm.....Tatsukette kudasaiiiii...........\>A</