Next/previous window switch in taskbar order in LXDE

I'm using lxde on openbox, lxpanel is opened on the bottom. I want to achieve to move between tasks/windows fast. But I can't find a way to do that, the feature I want is very simple: 1. An indicator(a small triangle or some other visual indicator) that tells which task/window is currently active 2. when I type Super+n/p to move to the task/window on the right/left. 3. [nice to have feature] provide a way to focus on a task/window by just using keyboard, maybe label the task/window with numbers. Is there anyway to achieve the above function? or there's some other better recommendation?