Maximum salary and I'm being very very optimistic and if your very very lucky would be 10k AED.
i agree with DD. 10k is way too high to expect. The max you can expect it 6-8k that comes with a lot of headaches, a panadol box & lot of nagging. Oh I forgot.. that is if you are working with auto dealers or high reputed garages.
Its not a bad market out here and not so hard on the other end, but only if you look into it properly & build your customer base & links properly.
I would suggest you to come down here and take a merry-go-@round, speak to few people in the market, see few garages & build links.
As DD said, opening up on your own might be just the option for you.
I have been into this line before but we closed due to lack of workforce.
So.. do your study before you do anything..
Just a note that, interest in modding saloon vehicles have dropped tremendously .. its about 4-wheelers and sand!