Seeds Have 5 Needs...

Soil - use any commercially available brand that includes vermiculite or perlite. Straight houseplant or topsoil mixes will be much too heavy for the seedlings.

Water -you will of course have to have a waterproof tray under your plants.

Light -once the seeds are up, they will need as much direct daylight or fluorescent light as you can provide - at least 12 hours of light to prevent stems from getting leggy. Of course, it helps not to start the seeds too early.

Warmth -most seeds prefer temperature of at least 60-70 degrees to germinate. If you are putting them near a radiator or by a heat source, make sure it's not too hot.

Fertilizer - most seedlings sprout from their own food source.

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Transplanting - plants are ready to be thinned out when they have four leaves. Pick out the thinner plants in each pot by their leaves, not their stems, and if you think they are strong enough to transplant, you can put them in other containers, prepared the same way as the initial pots, with a large enough hole the center to accommodate the roots. Do not bury the stems any further than they were.