Squatting 1.5X bodyweight might be harder then you think. I imagine that you probably would benefit from some more strength. But it's hard to know exactly what you should be doing since I don't know how much you can squat etc..

As for jumping style it's really not that big of a deal. You should be able to figure it out by playing basketball. Some people would natural be better at two legged jumping if they had good strength. But they are so weak that they prefer and are better at one legged jumping. But once you get your strength and plyometrics ability's up to a decent level you will start to get a feel for which you prefer. Once you get more advanced you can change your training a little bit to concentrate on one or the other. But as a beginner you should just concentrate on the basics.