I don't play RTS games because I am not good at them. So my question is, can I pause this game and issue orders at the same time in single player games?

You can pause the game in Seven Kingdoms 2 and command units around, after unpausing the orders will be executed. It's actually recommended to pause the game because honestly this game can be quite chaotic and overwhelming. If you are not that good with RTS and multi-tasking, Seven Kingdoms will be quite hard to play. Doesn't help that the AI is ruthless and can mess you up really badly.

Thank you so much for the reply. Greatly appreciated. I will try it out. Looking forward to it once I finish my current game.