Breela, join backyardchickens.com. They have over 120,000 members and lots of thread and ideas for coop building. They even have 4 coop building contests every year.
Hands down, everybody likes to use vinyl for the floor. Get discounted flooring so you can put down a single piece. You will want to have it slightly larger, so you can curl it up along the walls by a few inches. It's the easiest surface to clean.
Your birds are going to want to roost instead of spend much time on the floor. You can use the "deep litter method" and put down several packages of 3cu.ft. Shavings. You fluff it up every few weeks, and the poo falls to the floor bc it's heavier than the shavings. Then you periodically replace the bedding. Without going into detail, many people like to put a removable board at the bottom, so that they can use a broom to take out the old bedding, like into a wheelbarrow.