Good job on purchasing a set of triggers. Radio triggers are a must if you intend to photograph outside, or inside when shooting events since people often bring their own cameras and can set off your flashes.
The semi-pro DSLRs usually have a popup flash that you can use to trigger your speedlights.
If you want to try to properly light that bottle, you'll probably want more lights, and either a strip box or two, or maybe two rectangular pieces of white poster board.
If you do end up purchasing more speedlights, you may want to look into the Yongnuo YN560.
As you learn, you will probably really enjoy flash photography.