First, I'm going to assume that BDL's advice 2-1/2 weeks ago in “Japanese knife – question about stones” is a good place to start on any recommendation for stones. The main difference is that you probably don't have the import or availability problems local to Canadians who are trying to find waterstones. That means you can go onto the web without import=export issues.
Second, with a handle of “Emerald City”, I'm going to go out on a (short) limb and guess that you are somewhere in the Seattle area, since the tourist office in Seattle added that monicker a few decades ago. Otherwise, you might (or might not) be somewhere over the Rainbow from Kansas anymore (Toto)
(Sorry, but I figured I needed to get that out of the way before someone else brings up the Yellow Brick Road)
There are going to be a lot of people who can give you excellent information about freehand sharpening information, stones and stone sets from such Internet retailers as CKTG, JCK and others, so I'm not going to go into instruction, choices of grit, stones or web retailers, but I will give some advice on local to the Seattle area brick and mortar places where stones can be found or ordered. I'm going to start by cribbing from my own post in that earlier thread. That will be useful if your impulses in the Seattle area urge you to get a stone or two NOW, without waiting for delivery.
The Epicurean Edge (107 Central Way, Kirkland) has numerous stones, though many are identified on their web site as “Misc Maker” as the manufacturer..
Hardwick's (4214 Roosevelt Way NE, Seattle) does have smaller Suehiro stones (185mm x 64mm x 20mm), though I don't know if they are “Rica” line Suehiro's (for full details on Hardwick's, see my earlier post – which I can't seem to just lift and paste. Sorry).
Expanding on those two locations, I'm going to add Woodcraft (5963 Corson Avenue South, Seattle), which on their web site has numerous waterstones, from King stones, on up to Shapton Glass stones. Look up their web site to see the selection, and prices. I'll let you check on cross-comparing choice, availability and prices with CKTG and other web sites.
Hopefully, that helps.