I bought some blueberry plants a couple of years ago also and left them in pots, but potting them on last year, until a week or so ago when I finally got around to planting them in large pots - the soil here is not especially acid so I needed to create the right environment for them.
I am no expert but these things I know about blueberries from my Expert book and the
Dorset Blueberry Company, from where I got the plants and a lot of advice (before buying) over the phone.
For maximum yield grow 2 varieties, plant in acid soil (e.g. where rhododendrons/azaleas do well) or in stout pots at least 1½ feet deep (but I have planted some dwarf/semi-dwarf varieties in shallower pots) using a combination of ericaceous compost, loam/soil, moss peat, washed sharp sand, sawdust and pine bark chips (I had/got and used all of these except the sawdust, and mulched with an inch or so of fine pine bark chips that should conserve moisture in the pot and eventually rot down), birds love the berries so the plants need to be netted as soon as they turn colour, place in a sunny position, prune in winter, they shouldn't need any more nutrient supplement than is supplied by additional mulching and a small amount of fertiliser tea in the spring.
I also have a couple of cranberry plants, which I think I should be able to easily propagate into several more plants, which have been in a sunken butler's sink - they love an even boggier, more acidic environment than blueberries do - for over a year but which I could now put in with the potted blueberries, if I can keep the pots well moist. I posted a couple of days ago about a
rainwater collecting system I have rigged up so I think I should have enough neutral water for these plants now. Previously I had to use tap water occasionally, but compensated by also adding a bit of diluted distilled vinegar, which has worked wonders on the azalea out the front!