The first thing you need to do is figure out what you want. Ok, you know that what you have on there is not what you want so you are going to change it.
Do you have lots of bars laying around to look at and hold up to the bike or try and test fit? Probably not, but lots of us do, so do you know anybody with a selection of bars? You really need to consider the footpeg to seat to bar relationship for comfort. If you don't have a selection of bars then you can sit on the bike, close your eyes and put your hands out to where it is comfortable. Open your eyes and see where your hands ended up in relation to the original grips. That will give you a real good idea of where to start. Generally, you can go a couple of inches lower and farther forward than where you ended up to balance better, but not more than that. I bet that you will end up in the neighborhood of where superbike bars put your hands.
If you don't have a lot of experience with bikes beyond an oil change then I would not try and put clubman bars on! Go for superbike or drag bars and see how you like them. How do you think we end up with extra bars around to try out?
It is fairly easy to put bars on, but it is not so easy to do it right on every bike.
Vintage racing - old guys on old bikes