Okay, it's your first homebrew so I'll try to not be too harsh. (plus you make me discover "standard action")
Asking for an average of ability is unique I'll give you that but I don't see the need. In addition ability score rarelly factored in Prc prereq because you don't always control them.
The code for the table can be found here
or you can use that site.
Second your Bab and save are weird, they normally follow precise formula. Bab is either 1/2, 3/4 or equal to class level. And Save are either 1/3 or 2+1/2 class level.
Your missing the class Hit dice.
does it mean that they lose any proficiency they have before ? Can they mime exotic weapon and use them ?
That's way too short. Look in the Dmg or the Srd to see the standard format used to progress spellcasting.
You give a skill list but no skill points.
Lot of problem there.
-You should give example of DC for each type of item or creature.
-Need more detail about the item create. It is visible ? can it be destroyed , Can you create item of any size ? How long do they last (this is important) ? Can other creature use them ? If you create a creature does it obey you ? Do any item dissapear if you go to far from it ? can you create multiple item at the same times ? If you create an inteligent creature, can it come with class level ?
You need to put limit and guidline on that.
That's original. How can an opponent know that he can mime a weapon ?
Okay why not.
okay, flavorfull at least. Maybe add the need for an atonment spell too. Do you broke the oath if a foe use dominate person on you and force you to speak ?
Flavorfull but need a mechanical impact. Penalty on disguise check perhaps.
That need more detail and is way too powerfull. You need to stat if the creature get a save to avoid the curse, what sort of control the mime can have on the cursed creature ? how many cursed creature can it control (based on Hit dice like turn undead coul work) ? Does the curse limit a creature action (only mime ability or anything) ? If speaking broke the curse what's stopping the creature from speaking immediatly to get free ?
Yeah, lack detail too. What do you need to do to redeem a circus freak ?
For a first try it's not too bad, but it need lot of work. that said I like the concept.