Your fine just keep lifting and it will even out. Be mindful of the imbalance and utilize some unilateral exercises from time to time. Always be sure to do the same on each side, there is no reason to over compensate with reps, sets or weight. Because your new to lifting prior to working out your non dominant arm had no reason to adapt and become stronger. Also it had lower motor unit innervation leading to less potential for fiber activation. Think of daily movements. Closing a door is a press, opening a door is row, lifting something over head a front raise, etc. Most often all of these movements are done with your dominant arm. For this reason it will become more developed with higher nerve innervation leading to the imbalance in strength, coordination, stability and musculature. Now that your training and overloading each side causing adaptation your lagging arm will catch up rather quickly. Stick with free weight movements because they will force your body to stabilize and recruit more muscle tissue, this will speed the adaptation process compared to machines. Most initial gains in strength and stability in most new lifters comes directly as a result of increased nerve innervation and not gains in actual muscle tissue. Your forcing your body to recruit more of what you already have to complete a task, lifting. Best of luck and hope this helps just keep at it it'll even out on its own.