I'm not sure what type they are 1st looks like a jalapeno 2nd looks like some sort of birds eye or finger chilli.
I tried my hand at growing last year and had a massive crop, the tip i followed and think kept the single plant i had fruiting for months on into November was to take a dry clean paintbrush and lightly brush each flower with it to cross pollinate from flower to flower.
Meant to have another bash with a few different varieties this year but life got in the way. Maybe next year