Yes, you should be doing both strength training and cardio if you want the best results.
I suggest doing mostly compound exercises (exercises that work several different muscles). Some good ones are squat, bench press, bent over row, overhead press, deadlift, and pullup. Crunches will make your abs stronger, but they won't help very much with burning fat.
I'd suggest doing strength training about 3 days a week, and avoid working the same muscle 2 days in a row. I'd suggest doing about 2 or 3 sets per exercise, and about 8-12 reps per set, with a rest between sets. Lift and lower the weights slowly.
You can start with light weights, and then based on how easy it is, you can figure out what weight would be appropriate. If you find it easy to complete a set, it means the weights are too light, so you can increase the weight. As you become stronger, you should continue to gradually increase the weight.
If you're a member of a gym, there's probably someone at the gym who can teach you the exercises. If not, you can watch Youtube videos to learn the exercises.
You don't need surgery to lose weight. Eating healthy and exercising should be enough.
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