...go about growing these? when do i need to plant them indoors (in peat pots)?
When do i transplant them outside?

Sow your sweet pea sow one seeds indoors any time now.Depending on the size of the pot,plant one in a mini-pot two or more around the edge of larger pots.
Keep the compost slightly moist,without overwatering and the pots in a light position.Sweet peas need to be grown on in reasonably cool conditions and the resulting plants can be planted out around Easter,depending on the locality and the weather at the time.
Don't plant out sweetpeas during frosty,snowy weather or while the soil outside is very wet.
While planting out,provide some twiggy supports (Long prunings from shrums,hazel twigs,privet clippings) sweetpeas will attach by their tendrils and should give you a good show,