Preparation of you soil and pots is necessary if you want to make sure you have the best start for your plants. You want to be able to make sure both the pH and ppm of your starting soil is in the proper ranges. To do this, you want to do a slurry test on your starting soil:
After your measurements, pH balance the soil so that you are in the grow zone by premoistening it with water at the opposite end of your targets. Making it a habit to calibrate your meters every now and then helps too. Then add a small layer (1-2 inches) of perlite on the bottom of your pots to help prevent overwatering your plants.
Then add the premoistened soil and let the pots “brew” for a week prior to planting seeds inside. This will give your plants the optimal start for growing.