Eh, I dunno about WBP&H, I was never into playing-as-pokemon RP's. Or humans without Pokemon. But I like the offer! :3
Nope, you will not have any other pokemon.
In the first mission, the Patrolling AOS officers will prevent you from going out of Nutteini Town without a pokemon and you'll spend the mission interating with each other and more importantly, your egg.
Each bag has a random amount of money and items that your character will carry to start off in the RP. (You will also be given differing amount of luck points to start off with depending on what bag you picked). Each one of you will also be given a special device which I will not tell you about yet.