The minim amount to start with is $100 worth of BitCoins.
However, it is preferred to start with minimum of $250 worth of BitCoin.
If you wish to start with higher amount it is preferred to start with multi accounts with multiple of $250 for each account to maximize your earning. however, each account to be in different name that can be KYC verified. 
Accounts may be structured as like below:
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You are invited by: Mohamed Ali