OK... I realize you bought the Tojiro DP 3 piece set (nice set, by the way!
) and for the money it is probably one of the highest value sets on the site. This is purely my opinion, others might feel differently. lol However for sharpening your knives I would highly suggest making an investment in a kit like this 8 piece set: http://www.chefknivestogo.com/knshcoset.html
Now it is not all necessary, but it gives you an extremely good starting point to sharpen pretty much any sharp implement in the house and you can add on to it as you grow in skill.
At a bare minimum you will want this two sided stone: http://www.chefknivestogo.com/imtwosi1kst.html
With it you can keep your knives sharp, but it does not offer the same utility as the other set and you will most likely want to add to it much sooner. The other set would pretty much be all you need until one of the stones fell apart. lol
Never, EVER, use a pull through sharpener. Many of those will actually ruin the edge of a knife or shorten the life of the knife. Not to mention you could probably get the blade sharper on a brick or a piece of concrete... lol