Not bad for a first deck, however I wouldn't run more than 2 of a Legendary creature or you may end up with them sitting in your hand not doing much (and for a $15 card that's not fun).
You can afford to bring some of your creatures from the sideboard on to the mainboard and maybe switch
Naturalize to the sideboard, generally speaking artifact/enchantment removal cards are best on the sideboard; if your opponents have a deck with enchantments/artifact but you don't run removal for them your creatures can still do damage and be a threat, however if you run artifact/enchantment removal and your opponent doesn't have enchantments/artifacts then those removals do nothing and become
dead draws and waste 4 slots in your deck - Moral of the story creatures, creature removal and hard counterspells: mainboard, non-creature removal, conditional counterspells: sideboard. (Generally speaking)