I have been gardening since...well, I can't remember how long. I used to grow competitively, but now just grow for the fun of it. Next to tomatoes, peppers are one of the easiest and most forgiving plants to start from seed. I'll describe my personal method for what it's worth.
1. I only use my own seeds or those from a reputable source.
2. I start all of my pepper seeds in a soilless seed starting mix made from screening my preferred growing medium Pro Mix BX.
3. I start the seeds in a controlled environment. Peppers are particular to the soil temp they are being germinated in. A warm room is generally sufficient, but can slow germination a bit if it's not warm enough. It's not a big deal though as it only adds a few days.
4. Once the seeds are up, I place them in my grow chamber. Since I plant the seeds in early March and my greenhouses are unheated, temporary units, I have use grow lights. I don't use the more expensive grow lights, but just the sunshine spectrum bulbs. The trick is to keep the lights as close to the plants as possible, without touching the leaves. You should also cycle the lights on and off at 12 hour intervals.
5. I don't start fertilizing until the second set of true leaves develop, then I start feeding with a weak fish fertilizer, ie Alaskan Fish or other such product mixed at 1/4 to 1/2 the recommended strength.
6. When I start feeding, I also pot the plants up into 4" containers using Pro Mix BX as the medium.
7. As soon as I can rely on temps in the greenhouses to remain above 50°F, I move the plants outside. Peppers do not do well below 50° because below this temp, Potassium uptake is severely hampered leading to purple colored leaves, especially on the underside.
8. Around May 21 I move the plants into the garden. I mix a good double handful of compost into each planting hole, and stick them in.
And since everyone loves pics here are a few of my gardening escapades over the years:
Here are some peppers in the grow chamber:
A few of one of the hoop houses:
Broccoli and cabbages, thanks to my lovely wife for posing for scale:
Here’s a nice tomato:
And finally, some of my giant pumpkins:
FWIW, I can also read and interpret soil tests and make recommendations to improve your soil, as well as identify many plant related diseases and problems.