How can I construct my own deck in yugioh?
First Off i would buy a starter or structure deck, each one comes with a ruelbook on how to play, then i would buy some booster packs to suit that decks style, or you may shop online for single cards ie: ebay or koolkingdom.co.uk , some structure decks come with a strategy sheet and advice on what boosters to buy next, sometimes with structure decks you may want to buy 2 or 3, as multiple copies of some cards may help, if you already own some card then i suggest laying them out in front of you, and choosing 25 4 star monsters or less and 5 5 star monsters, and 10 spells, traps and magic cards, you may add more but try to keep you deck to 50 or less cards, to be more effective.