Thankfully, we've already done the footwork, and can serve as your guide to gifts in the popular TCG simulator
You +1 it to attach to your critter and then it now cannot be attacked to be killed, it gets a +1/+1 counter and then when the attached dork smashes face, you put that many loyalty counters here
This never adds to the board on it's own, but presumably the cards it draws you will help you add to the board on subsequent turns and the drain life effect is nuts with Mobilize
Perhaps you will start the game with a certain amount of Energy in your Energy Zone, and you will only be able to attach one Energy per turn from your Energy Zone to your Pokemon
The Deck Builder's Toolkit is designed for new players to kick start their collection and give them some tips
If youre starting to view your collection as a serious investment, a paid subscription might be worth considering