[header] How to grow chili peppers indoors [title] Fill your seed starter cell with soil. [step] Fill the cell almost to the top, as chili seeds don't need to be planted very deep. A good soil choice for chilis is a rich soil-based compost. 
Because chilis need good drainage, look for a potting mix that also contains vermiculite or perlite. [substeps] Because you're growing the chilis inside, it doesn't really matter what time of year you plant.