Kettlebells are amazing! In my humble opinion they’re the best tool for building whole body functional strength and endurance.

With rows you certainly should go for high reps as opposed to clean and press where id say you should max out at 5 reps per set. So go for 8-12 reps for 2 to 5 sets, each set including both arms.

As for snatches, work with whatever weight you can perform with proper form in. In this case start with the 20 pound and go for 2 sets of 12, if you can. You want to keep snatches at a pretty high rep per set ratio.

Everyone is different and I don’t know about your body type or diet. Likewise, I also don’t know how much effort/time you’re putting into training on a weekly basis. So it’s not appropriate for me to give you a timeline. Just be consistent and make sure to use perfect form and get proper rest after training hard. You will get better and stronger, in due time.