Ditto.
Be careful not to do too much too soon.
Very often owners have in their heads how things should and shouldn't be, how he should & shouldn't behave, etc, ratehr than stepping outsied of the box and looking objectively at the whole suitation from his point of view.
People will always claim that they would never let their youngster get away with this, that and the other, but never forget that your horse is a mere baby and you simply
have to allow for this whether you liek it ornot, bearing it in mind every time you handle him.
Therefore yes, he outght to respect you, but come on - school children aren't taught one thing about correct behaviour/dicipline and expected to rememebr it forever and never cross the line, because they will be pushing and testing these boundaries all the time. You simple have to remain in ontrol and be patient, consistant and persistant in your handling/training. Repetition is essential to reinforce the objective.Make sure that all training sessions are short and sweet - a maximum of 20 mins at any time (2-3 sessions a day are very useful) and always end on a good note. Praise your youngster when he does well and yuo need to become aware of when you need to ingonre unwanted behaviour (i.e. high jinks and playfulness) and when to assert yourself more and correct your horse (i.e. when he actually bites, kciks, refuses to be led, etc).
Try to make sure that your horse does not get bored. It seems that your horse becoems bored easily and so he pranks around to entertain himself; keep training sessions fun and don't complicate things. be careful that these sessions do not turn into a chore. Learn to recognise the signs of when your youngster is tired and/or bored.
I strongly recommend that you read/buy Michael Peace's book "Think Like Your horse" where there are some incredibly helpful and useful tips and advice on exactly how to train and handle young horses, and on instilling the basics/establishing a good early education in your youngster.
I also can't emphasis enough how important it is NEVER to hit your youngster. If anything destroys any trust you have earned in minutes, it's this. This type of 'discipline' causes more problems that it is worth and does not solve anything - horses do not understand it and they will learn to fear it, possibly becoming headshy and mistrustful of you. Please, just don't do it!
Good luck and remain positive!
xx