I've not tried seeds that have been frozen before, but I can't see why they would not work, they have not been tempered in any way....
Any fresh green finger chillies you buy will work, Jalapenos, Scotch bonnets, red, green, they're all seeds at the end of the day.
I just get a seed tray, layer it with about an inch or so of compost, press it down, lay the seeds in the tray, cover with another inch or so of compost, press it down, water the compost, not too much or the soil gets saturated and can rot the seeds.
Keep them in a warm dry place, preferably in the sunlight. ( A windowsill works well). Kepp out of the frost.
Chilli seeds do take a while to germinate, so don't poke, pull or do anyrthing with them, just leave them be and when you feel the soil is getting dry, give them a drink... this is why you need to start them off on Feb or very early March...
Sooner or later you will see little green shoots sprouting up through the soil. Just keep watering them when they get dry and give them as much sunlight as you can but keep them indoors.
When they are about 2-3 inches tall and thin and scraggly, carefully transfer them to individual pots, then care for them exactly as above..
They should flower around late July/August and produce fruit shortly afterwards
