1-. Sword
2-. Bow
3-. Pickaxe
4-. Blocks
5-. Blocks
6-. Blocks
7-. Blocks
8-. Golden apples
9-. Steaks
The spaces that I have left are used with blocks, since you never know if you are going to be in a chase and you will need to use the blocks to flee.
Also, this may vary. That hotbar is what I usually have in fast games, but in those that last a lot, I usually have:
1-. Sword
2-. Bow
3-. Pickaxe
4-. Glass / obsidian / tnt
5-. Blocks
6-. Ender pearls
7-. Enchanted golden apples
8-. Golden apples
9-. Steaks
Everyone organizes their hotbar in a different way, I do it in this way because it is easier to control and use that way.