What is the value of all the Warhammer 40k tau troops?
Unfortunately, knowing the points values of models is only the start of the information you need to build your army. You will need to know the force organization restrictions, army-specific special rules (for which you need the codex) and universal special rules (for which you need the rulebook). If you’re just starting out with Tau, then you really should get yourself a copy of the codex, as it’s a matter of gamer courtesy. If your opponent wants to see how a special rule is said to work, you should be able to show them the exact text in your codex. Plus, you should always be able to refer to the book yourself to ensure yourself that you know your units’ stats.