Keep them hot and don't over water. Give them chilli or tomato food. When they flower touch the inside of the flowers to help them germinate.
Good luck!
They're dead easy, and will be quite happy on a kitchen windowsill.
Some Birds Eye chillies won't germinate unless they've been through a bird's digestive system, and so won't grow from seeds from a fresh chilli. But the packet seeds will.
i grew thwm in the conservatory last year and they were a great success over 150 chillies. I blanched them and froze them, still using them now. Have another plant on the go, for this year.
Have fun