Presses from the split are a great exercise for beginning lifters, and there are more than a few that arent really beginners anymore who could really benefit from them too. The key to this lift is to pay very close attention to the geometry of your legs in the split. The front shin should be vertical, with the toe turned slightly inward and the back thigh should be as close to vertical as possible with the heel up and the toe in on that foot also. For a few lucky souls this will be an easy position to hold, but most of us mortals will really have to struggle to hold that position as we press the bar. Use a light weight. Keep in mind that this is more of a lower body exercise than an arm exercise. A few freaks like Donny Shankle can use over 300lbs but most of us will struggle to use more than 30 or 40 kilos.
These should really help you get stronger in the correct split position. I usually try to get lifters to work both legs equally, in other words do a set with your right leg split in front then immediately go to your left leg in front. Some lifters find that all the practice in the jerk leads to unequal development of the legs which can predispose them to hip problems. Presses from the split can go a long way towards combating that. I like 3 sets of 10 reps alternating legs.