You probably shouldnt be hassling coach thib with a question like this, so next time put in the beginner forum. In regards to imbalances generally whatever hand you use for day to day things will be the stronger side. One method i have been using for a while now and got recommended by @kd13 is to use your weaker arm alot more. (Shopping/groceries, lifting weight plates onto the bar, picking things up etc) with your left side. In regards to single limb exercises dont just throw in 3 sets of single arm bench presses on one side. Use your weaker side first then aim for the same reps on your stronger side, that way it doesnt get worked harder then your weak side. Etc.