play DQ to get a feel for the game.
read the Codex and the DQ Forums to see what other players have learned and shared with other players.
experiment with crystals and myth stones to see how they change and affect your game play.
don't let Delete Character take control of your game.
random drops are ok in the early game, you can customize your items later after you learn a little more about the game.
pets are fun, and add 6 more affix slots for your characters benefit, in addition to their special natures (an ability each pet has that can help you in your journey through DQ).
hope this helps.