It's funny that there is always advice against lifting weights given by people who have never exercised to amount to anything. I lift weights, but not for anything specific for any sport. You need to work everything. Spend more time on strecthing than on lifting. Don't lift to see how much you can lift. I've never done that and have never been injured. I did start in 1963 though and it's a good thing that I didn't have more than 110 lbs. when I was a teenager. I squat 365, do flat flys with 45 lb dumbbells and do various bicep curls. 12 to 15 reps on my final sets. I've been doing the same routine with weights, which does vary some each week to a schedule, for 13 years. I'm 57 years old and just started golf this past August, although I did live across the street from a driving range in 1973. I'm 5'7" and 180 so not exactly a hulk. I drive over 300 yards with roll from my 3 wood. Just installed an xstiff in my driver so am anxious to try that tomorrow after the epoxy has had plenty of time to cure. Playing around in Golfsmith last week I found out that my controllable swing speed was 120.6. My best score so far has been 2 over on 9 holes. My putting needs improvement. If I hadn't been exercising all this time I think my entry into this sport would have been a bit different.
Lifting weights can only help your golf. Don't overdo it. Go slow letting all the muscles in supporting roles learn their job. I only work each muscle group once a week but I'm just trying to maintain, not to keep building. Spend much more time stretching than you do lifting. Heck, being fit strong and flexible will make everything you do more enjoyable. I've never seen anyone I consider to be really strong who does not work free weights.