A wide range of different colours, shapes, textures and eating qualities is available. Whatever you choose, grow them organically and they'll taste even better. Some have better resistance to the common potato pests and diseases than others. Always plant good quality certified seed potatoes to avoid introducing pests and diseases. For a flying start, 'chit' seed potatoes before planting.
Tubers can stay safely in their trays until planting conditions are right.
Planting If the ground is weedy, either clear off the weeds or cut them down to ground level, using a mower or shears. If the ground is very dry, water it well. If you have neither manure nor compost, use a proprietary brand of bagged manure or an organic fertiliser instead. You can 'plant' your seed potatoes in April - early April in warmer areas, late April where late frosts are common. No Dig potatoes do tend to be more prone to frost damage as the mulch used keeps the soil cold.