By "tags" I'll assume you are talking about Disney's Magical Express luggage tags, the pre-printed, yellow-sticky-paper tags. If you already have enough tags, in total, then there's no need to have any with that child's name on them. If you don't have enough tags, just call DME (866-599-0951) and ask for more.
As far as park tickets and
Disney Dining Plan credits ...
All of this is handled electronically. The tickets and credits are not physical entities.
When you check in at your resort, each person in your party who is age 3 or higher will receive a room key, which looks like a smooth credit card and has a magnetic stripe on the back. This is not just the key that opens your room door, however. Encoded on the card's magnetic stripe will also be your park "tickets" and your
DDP credits. It's all on one card! In other words, you'll never receive a large packet with paper tickets and paper dining vouchers.
In addition, you also have the option of setting up a "room charge," which will also be linked to your room key. You have the option of putting down a credit card, debit card or cash to back up your room charge. You can use this room charge to make any purchases in the theme parks, in the resorts, and in some of the shops/restaurants in Downtown Disney.
All of that on the one little card!