It's very important to start with good genetics. You should attempt to find seeds from local gardeners that are acclimated and bred for local climate and best floral characteristics. Potency, aroma, fast growth, early maturation, resistance to fungus and pests. All of these factors are considered by the seasoned gardener and you will benefit enormously by finding a friend to get you started on the journey that never ends...

Attempt to find an Indica/Sativa hybrid if possible, as this will have the best high and good characteristics for indoor growth as well. Indica plants have a heavy, stony high that is tiresome, and sativas' are hard to grow indoors due to high light requirements, and late flowering traits, so a hybrid can be bred that will have the energetic, cerebral high of the sativa and the early maturation tendencies of the Indica plant. The Indica plant is easily recognized by its extremely broad leaves that are very rounded on the sides. The Sativa has very narrow, finger-like leaves. A hybrid will have qualities of both and have leaves that are a cross of these two types, thinner than an Indica, but much broader than a Sativa.It is possible to recognize a good hybrid by the leaves once you know what to look for.

Look for seeds that are dark brown or light grey. Some may have dark lines inset into these colors, like tiger stripes. White, small seeds are immature and should not be planted.

Where to get good marijuana seeds?

My recommended source for seeds would be from the Sensi Seed Bank. These guys are the real deal, although they are only able to ship to certain countrys due to laws.