If he uses his ability to force all my creatures to attack Gideon can he then use his creatures to block those creatures Gideon is forcing to attack him?
You're asking if creatures can block other creatures attacking a Planeswalker? The answer is yes.
He has say 4 creatures n uses Gideon Ability that says all creatures attacks Gideon so on my turn his creatures can block the ones Gideon is forcing to attack him directly due to effect normally I know creatures can didnt know in this case cause of wording?
You attack with all your guys, he blocks like he normally would.