You can manage & track your card collection and decks once you create an account and login.

How to Play
This document will be updated in the future
In the mean time, Aequitas has a pretty good How to Play based on WotC's original explanation.

Additionally, Wreck 'N Rule have a lot of great articles, including Deck-Building for Beginners.

Starter Decks
These are some decks that are good for beginners to learn the game with. They use most of the common mechanics, while avoiding card interactions that might be a bit too much for someone just learning the game.

Official Starter Decks
Autobot Starter Set
Bumblebee Vs. Megatron Starter Set

Official Preconstructed Decks
Metroplex - Precon
Devastator - Precon
Blaster - Precon
Soundwave - Precon Starter Decks
Starter Thunderbee
Starter Timecop
Starter Stormtrigger
Starter Battlechargers

Other Decks
Stage 3 Lockdown
All Spark