Ok, firstly, you can play the character that you want, male or female, whichever works best for you. I want you to be happy and comfortable with your role, which leads to a smoother roleplay.
For my characters bio, she would be from a Marine unit in Florida, rushed to Atlanta to bolster the garrison and local cops there with her unit. But of course, there were too many undead for even those many guns to hold back. She would have been in Supply, but rushed into combat once it was clear that more guns, even those of the rear soldiers, would be needed.
For a roleplay like this, sub and dom themes dont quite fit. We would both be equal. This is a story, a world that we're creating, and I like it to expand and grow with what we put in. We're only limited by our imaginations, after all.
As to posting length, at least a few paragraphs. I dont expect thousands of words, enough to keep the roleplay going, and bouncing off what the other is putting in.
I try not to make typos. I miss some comma's, try not to hold it against me.
If you want, I can do the opening post, tell you which forum its in, and if you like it, you post a reply. How does that sound.