Try to handle the AI's early game with cards such as Maveloft Huntress
(even as a 2/1 killer to kill their 1 drop), Vicious Overgrowth
and utilizing Steely Resolve
to counter their cheap tempo swingers (torch/finest hour etc) while smoothing out your hand with Evenhanded Golem
It's very important to keep the board clean and set up blockers.
You have no board wipe. You have almost zero healing.
You should affect the board on turns 2,3,4 as much as possible. Usual good starts include affecting the board on turn 2, smoothing your hand on turn 3 (for example using petition and playing a Primal symbol to make sure you have undepleted power for next turn so you can slam a 4drop), and affecting the board again on turn 4 by using 4 power.
Mulligan any hand that doesn't have a way to do this. Specially against aggressive decks.
After that you will be doing some stupid shit and hopefully have a lot of fun.
There is no practical reason not to include a second color (Time for Wump & Mizo
/etc or Fire for Sear
/etc) Over using colorless synergy. I just like playing mono color.