I just ran into this same question myself this week.
Read the sticky's of fermenting 101 and sauce making 101...great info but it left me with the same question trying to fully understand the info i was reading.
First off get a food scale that weighs in grams.
Next prepare your peppers and then get the weight and write it down.
Now you can start doing the same for other ingredients you want to add....write down the weights of each finished ingredient (washed, peeled, and ready for use)....you don't have to add vegetables etc....if you dont it will be more of a pepper paste. You can use the paste by adding it into salsas, tomato sauces, drinks, cassaroles etc etc etc.
This is not a recipe but an example of how to figure out salt needed for a fermentation.
No whey or starter is needed. This is referred to as a "wild fermentaion" and i just made my first 2 days ago.....look up the thread by Buddy fermenting 2016 in the sauce making forum.
This will give you pictures and some ideas for fermenting for sauces.
So as i said, this is only an example of how to figure out the salt for your total weight of ingredients....measured in grams.
Hot peppers 200 grams
Carrots 100 grams
Bell peppers of your choice 150 grams
Onion 100 grams
Garlic 75 grams
Fruits peeled and seeds removed if using 125 grams
Now add it all together total weight combined equals 750 grams of peppers, veggies, fruit.
Now for the salt... I was advised to use 4%
200 grams (peppers only) multiplied by .04 (4%) = 8 grams
750 grams (peppers+veg+fruit) multiplied by .04 (4%) = 30 grams
Place all 750g of ingredients in food processor and fine chop adding the 30g of salt.....or just the peppers and the 8g of salt.
Most advise canning/pickling salt. No iodine.
Remove to bowl....stir....place in your sterilized ferment jar with airlock and you just made your mash.
Let it sit etc etc.
I am a total noob but this helped my understanding of getting started without whey or other starters.
Good luck