Income from brokerage and commission

no, commission income not eligible for presumptive taxation

Agreed with Saud Ahmed's reply.

no, you are required to prepare BS P&L ...you can opt for preasumptive taxation scheme

If the income from brokerage is one time and/or casual in nature (some time it may be there and some time it may not be there) then it needs to be considered as income from other sources and ITR1/2 shall be most suitable.

However, if the income from brokerage is going to be substantial, every year and year after year, then such income shall fall under income from business and Profession and ITR3/4 shall be suitable.