Seeking professional native Arabic speaker

Hello everyone I'm running an educational course and I will like to hire a language an american sign language interpreter to translate the words with sign language that will be use in lecturing in the sign language.
And I would like the translator to carry out translation with the following precautions
1 proper modifications of words
2 breaking down of high vocabulary to simple vocabulary
3 simplification of words (general human translation)
Note: translating application not permitted to carry out the job because we want quality results

Thank you