Instructions for growing peas are readily available, but my approach to growing them is determined by two features of where I live - WIND and precious little topsoil. Pea plants are climbing plants - described as having a "vining habit," their tendrils are amazing in their capacity to cling on to anything that helps them reach up to the sun. However, there is a bush form of the sugar snap pea, and that is what I use - I don't want them growing too high because the wind will just wreck them, and they are ok with being grown in pots.
Pea plants don't like really hot weather and so are best planted early in the season, with the aim of having lots of production before high summer. But I plant them when I remember, confident that we will not get too hot in the summer - there is an upside to our less than perfect weather!
You have to be careful not to disturb their roots when transplanting but I prefer to plant the seeds in starter pots to protect the little plants from snails and wind till they are reasonably robust. Then I transplant them in groups of 3 or 4 into reasonable sized pots - at least 30cm diameter and around that in depth to give a decent root zone, in a mixture of home-made compost with some commercial potting mixture and a bit of fine pumice added to help with drainage. While they are more tightly packed together than recommended, they protect and support each other this way.
I can move the pots to keep them in enough sunshine and enough shelter - it's a pay off.
They will often have less than the recommended minimum six or so hours of sunshine, but still they thrive. I do have to remember to keep them from drying out - pots and raised beds are much more vulnerable to this.