What do I need to do to marry my foreign boyfreind?

The most efficient approach is to request a fiance visa for your boyfriend by filing an I-129F (that's form number).  That form is filed here in the US and once approved, the nearest consulate in England then processes the visa.  You would have to marry within 90 days of his arrival on the fiance visa.  Once you are married, he had apply to adjust his status to that of a lawful permanent resident.  You don't need a job if you have enough assets or a joint sponsor, but if you do rely on your own income, it must be 100% of the poverty level for the number of dependents you are responsible for (to obtain the K-1/fiance visa) and then when applying to adjust status, you must show income at 125% of the poverty level (which can be done using a joint sponsor, like a friend or family member).  The filing fee for the K-1 visa is $340.00 but you'll need to pay the consulate to process the visa (several hundred more dollars).