Growing oregano from seeds is very easy, it just takes a couple of days to germinate.
Fill a pot with soil and make the surface damp. Place the seeds on top and press gently so they have contact with the soil. Oregano is light glowing so don’t cover the seeds. Use a spray bottle to keep the soil damp during the germination.
When the Oregano has grown for about 5-10 cm you can start to pluck the tips. What this will do is making the stems divide in two, so the more you pluck them, the bushier it gets.
Put the parts that you remove on a piece of paper to dry and finally place them in a jar, ready for use.