I seriously hope you don't think your summoning a phsyical touch and feel dragon onto this plane. If you are you might have better luck at strikikng the jackpot lotto. If your trying to summon a dragon on the spiritual plane, you might want to first not summon, summoning is considered rude, summoning is demanding or forcing a being to your presence, how would you like to be plucked from where you are to the presence of some person who wishes to control or demand things of you :(
If anything I suggest learning the basics, especioally meditation and visulaization, and then start studying and learning astral projection. Once and if you can AP, then you might call or invite a dragon to your aid in the astral plane/spiritual realm.
Peace be with you, and I wish you the best of luck,