In general plants should be put in rich well amended soil (dark brown with worms). If you don't have that, add some worm castings or compost. If the soil is bone dry please water it the day before you will plant. Ideally you have a loam soil (squeeze it in your fist - it should make a shape that holds for a couple seconds when you release). but if you don't add some good quality potting soil. It's best to dig a hole twice as large as the pot the plant was previously in. Gentle tease the plant out of the pot and position into the hole so it makes firm contact with the bottom. It's safest to position the plant in the hole so that it's at the same height relative to the ground that it had in the pot (some plants like to be buried deeper but not all, so best to keep it at the same level). Gently tamp down the dirt so it doesn't end up caving in when you water. You want good contact between the plant roots and the soil and loose fluffy soil (don't compact it by using lots of force to tamp it down). Newly planted starts need some protection from the heat of the sun - I use cardboard to make a shade and keep it on for a day or two. it's best to plant in the late afternoon so the plant has overnight to settle in before it has to manage the heat of the day. Keep the new start well watered (a soil moisture meter is great for this!) and keep an eye on it for the first week and then it should be good to go!