You are on the righr track starting easy. Give yourself that month to just get some fitness back (will happen quickly), and get your movement patterns etc in order with the weights. Machines are a good safe way to get back into it IMO. Of course when you get back to free weights, take those slow and steady also.
As for rep range etc, it doesnt really matter at this point. Id just look to do more on a per week basis. This can be as simple as just adding a bit of weight to each movement, each week.
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