Its just a fancy word for practicing running after a bike ride - don't worry, just practice!
To add some more tips:
Swim: start early on technique (as you have a year). IMO swimsmooth (Paul and Adam) are the best source of coaching online and their material is excellent. Lots of tips on their website, a great book, and lots of material in the training section on tritalk. In time learn about CSS training (from their website) and get used to training at this intensity. Plus you will need to buy/hire a wetsuit and get used to OW swimming. You can't "win" a tri in the swim but you can lose it!!!
Bike: is key! Good fit. Aero bars. Cadence and pacing. Get the miles in!
Run: Pretty straightforward 10k training but with added bonus of the previous 1.5k swim and 40k ride!! At this stage not much to worry about. Build speed endurance.
Nearer the date, you can start thinking about tips, nutrition, kit etc - eg elastic laces, practicing transitions, lubrication (!!!), energy stuff. Look for end of season bargains (sic) re trisuits etc in about 1-2 months time.
Warn family that you will be addicted as you build up to Half/full IM over next four years!!!