A reasonable goal would be to continue to lift for three months, followed by four, five, six, etc.
Goals are set by you, for you. There are big goals - several years down the road - and there are smaller goals - 3 to six months out. They must be well thought out, specific, important to you, and realistic. They must also require some stretching on the part of the goal setter. For instance, “I’m going to eat six meals per day” is a goal that is certainly attainable, but not too much of a stretch.
However, “I am going to follow John Berardi’s Precision Nutrition, clean up my diet, change my body composition to no more than 10% body fat, and add 10 lbs of lean body mass by June 2007” is a reasonable goal that will require much more from you than going to McDonald’s six times per day.
Being that you have been working out for a couple months, you should set short term goals as far as the lifting goes, the nutrition, and a long term goal for where you want to go with all of this. Nothing too difficult or complex, but difficult enough so that each workout you can feel yourself getting closer to success. Don’t expect miracles overnight and you will not be disappointed. Be patient and have fun with it.