When you need to get someone's attention, you can whistle or hiss. If beckoning someone closer, don't turn your palm up and wave your index finger. This is how you would call a dog. Instead turn your palm down and wave all of your fingers. Picking your nose in public is not considered rude, but putting your feet up on a chair or table and showing the bottom of your feet is.
Men can urinate in public as long as they face away from people.
You may greet anyone older than you in this way. You can wear shorts, but it's not recommended. For men it looks childish and for women it can be considered promiscuous. African women do not show their legs and in general dress very conservatively. Near the equator, the sun rises and sets at the same time every day, usually 6am and 6pm.