Returning for the 4th or 5th badge is tradition, although some come back as soon as the 3rd. I always love it when young trainers return home. It's like a pidgey flying back to its ancestral nest during the summer. Almost as if its instinct.
Speaking of Pidgeys, three of them flew up to Lillian holding a bag and a cell phone. Ah yes, your supplies as you begin your journey. I'll give you the most important one first. She hands you the cell phone and a plastic card. This is your pokegear and your trainer license. Your pokegear is a cell phone and a map, which is vital for any beginning trainer. The card is your trainer license, your link to the world of pokemon training. Right now you're what's known as a Rank 0 trainer, a Starly who is flying for the first time. As you gain badges you will rise in rank. Never lose this card: it is essential for any of the services that trainers rely on.
In the backpack are five pokeballs for capturing pokemon, three each of full heals, potions, and bandages for healing pokemon, a Pecha berry that will cure any poison that your pokemon experience. Finally, there's a TM of Struggle Bug, a ranged bug type attack that will serve Jasper well.
I believe that's all I have for you. If you have any questions, now would be the time, but you can always return if you need assistance.