What Pepperhead said... and also, if you're going to plant in the soil outside, the first thing is soil preparation. I recommend you get your soil tested for pH and nutrients. The testing pays for itself in saving you money that might be spent on nutes you don't actually need, and eliminates the worry that you might have forgotten something your plants need... hence giving you the confidence to leave your chiles alone to grow and not loving them to death. A lot of newcomers make the mistake of overwatering and overfertilizing their chiles.
Next... put down black plastic thermal mulch or black poly plastic a few weeks ahead of planting to pre-warm the soil and create a warmer micro-climate for your chiles. I got a huge jump on the season by doing that and setting up a hoophouse over my pepper rows with 10 foot sections of half inch PVC pipe for the framework and 4 mil poly sheeting over that. Put heavy rocks or sandbags on the edges of the plastic to hold the hoophouse down in the brisk spring wind. The poly keeps the rain and hose spray out of your chile bed, so either put drip hose under the black plastic or take the weights off the edge of the poly sheeting on one side of the hoophouse and water the plants, then replace the poly sheeting and the weights. This way you don't have to water the plants on your hands and knees! Plant the chiles in holes punched in the black plastic mulch. When the night-time temps rose into the low 40s consistently, I swapped out the poly sheeting for Agribon 19 fabric. When the night-time temperatures climbed a little more into the mid 40s, I took off the hoophouse but left the black plastic on the ground for the rest of the season.
Don't over-water! To avoid root rot, chiles like the soil to be moist, but not saturated. To avoid leaf spot, apply the water to the ground under the plant and avoid getting it on the foliage, especially if the chiles are planted close together.