But I can tell you what works for me and share a few photos of how I get on
A lot of people think that all hot peppers are is "hot" when in fact nothing could be further from the truth. However when you are just starting out to grow chillies it is probably the most important thing to consider. There is not much point in spending a lot of time and effort growing a beautiful chilli plant and when you harvest your chillies discovering that you can't eat them as they are far too hot for what you want to do with them. Likewise if you are a hot sauce fan and hotter is better as far as you are concerned then don't bother with a mild Japaleno
If you want to find out what suits you then take a look at the foods you like and see what chillies are used in them - if you buy chillies from the supermarket then look and see what you like. It may not be possible to buy seeds for that exact chilli but if you then look at the variety on the Scoville Scale you can find something similar in heat.
For those that don't know the Scoville Scale a simple explanation for it is - the hotter a pepper is the more sugar water would have to be added to a tiny extract of it in order for that extract to lose all its heat