Yeah, the pay you get from BDCP is your money you can do with it what you want. I am not sure if you can use the GI Bill while get BDCP money too (I am not prior so I have no idea), but the money I get from BDCP basically covers all of my tution for the last four semesters of college with some extra left over.
To your first question I assumed you were asking what pay grad you are at with BDCP. For me I have E-3 less than 2 years in service, Base Subsitance Allowance for enlisted, and Base Housing Allowance enlist without dependents for Iowa.