As far as I know, rumour has it............
You can get in with no time at all. Your time is more than enough, you train in France and you pay for it yourself. Not 100% sure but I think they fly you there as they get KLM discounts. Also I belive they give you an allowance while you are there. Yes you can start on the ATR, unless you are a Tanzanian you will NOT get command, well if you do you will be the first. Pay I am not very sure I have heard different figures, the most common is 2000USD per month and you get some overnight allowances etc. I have also heard a crazy thing.......You pay for your training up front I think its 20 000 Euro and then you are still bonded, ie not free to leave when you want.
If you have 3 000 hours why dont you for the same money get a 737 200 rating and upgrade it to a 300 and gamble your left over cash and try to win back the cost of your training. You will be making a better choice.