My little one is only 8ths old, so I am not the greatest advice giver on this. Everything I have read states that children lack empathy until around 18 mths. Until this time, they know how to tell you "no" and they know,to some degree, the meaning of "no", but are unlikely to obey. It is best to be consistent but also understanding and gentle.
My sister has a son a little older than your little one. If her son pokes someone or hurts someone, she gently grabs his hand and tells him to be gentle (she then may guide the hand to pat the person softly - correcting the action instead of just saying no). If he gets in to something (example - outside), she tells him no and explains that if he does it again she will have to take him elsewhere (example - inside). If he keeps at it she will take him inside and explain why again.
The key at this point is definitely consistency. Start out as you mean to go on (respond to these issues the same way you see yourself responding 5 years from now), but, at the same time understand that it is an ongoing process and that, at this point she is likely not capable of "obeying" you.
Also, think about how you like to be treated when your spouse or someone else corrects you and try to treat your child with that same type of respect. It won't be right away, but they will eventually learn and treat you with the same respect that you treat them.