Pokémon Mystery Dungeon: Blue Rescue Team and Red Rescue Team/Walkthrough

The Personality Test
Like all the Pokémon Mystery Dungeon games, the game starts with a personality test to determine which Pokémon you are.

Once you have completed the personality test, you will be asked to choose a partner. The available Pokémon are:

All of the info was taken from the Starter FAQ @ GameFaqs

Choosing your partner
Your partner may be any of the 9 starters at the main games, or. Your partner should be chose carfully to cover as much weeknesses your starter has. For example, if you chose, his weeknesses are electric, and grass. A grass type will protect you well from both, but if you want to go for the offense, grab a fire-type assist and hit the road.

After You Finish...
After choosing a starter and a partner, you'll be thrown into the world of Pokémon, and wake up in Tiny Woods.