you can make so many mistakes as a beginner, you should consider
starting with bagseed. They're free, and you know ahead of time what
the final product should be like.
So if you are wise you will save some seed from buds which you
consider to be good and learn from your experiences as you grow them to
On the other hand...
Having invested in expensive growing equipment and supplies, buying
good quality proven genetics can be considered a worthy cause, when you
consider the time you are about to invest growing them.