Hello.
So the first thing that needs to be brought up is your mana base. It shouldn't produce black mana at all, as your deck runs mostly on green and white cards, your lands need to reflect. You want the two pie charts to be about even. So, add in lands that produce either white or green mana and take out others until you have the correct amount. In addition, the non land cards that produce mana are not needed. Fixing both of these problems will make your deck vastly better.
Now, you have a lot of singles in your deck. This makes it less consistent, which usually is problematic. I would suggest looking at the cards you think are the key cards and adding more of those and cards that compliment them. Example, you have
Bonds of Faith in your deck, which is best used with Humans. You only have 5 Human creatures in your deck. So, I would either remove
Bonds of Faith, or add more Humans.
Something everyone needs to ask themselves when building a deck is what that deck is trying to do? How does your deck plan on winning? Does this deck match how you play (aggressive, control, etc...? What can my deck do and what can my deck not do? These are all important questions. Knowing those answers will let you build stronger decks.
Overall, for the first deck you have made on your own, it is fine. Eventually, you will be able to make it even better. Good luck!