First decide how you wish to control these new flood lights... timer? dusk to dawn sensor? motion sensor? all together or separately? I do not recommend motion sensors because they will go bad depending on their exposure to the elements. Also consider the light pollution towards your neighbors and aim the light downward. Here is a good fixture to consider - http://www.lowes.com/pd_112029-337-FSS1530LPCWUT_4294798225__?productId=3743713&Ns=p_product_qty_sales_dollar|1&pl=1&currentURL=%3FNs%3Dp_product_qty_sales_dollar|1%26page%3D1&facetInfo=

the only thing I want them to do is turn on when I flip a switch. not worried about dust to dawn or motion...I did wire each one seperately

Then this type is all you need.
http://m.homedepot.com/p/Bell-2-Lamp-Outdoor-Flood-Light-Kit-White-5876-6B/204207996

Take into account energy usage.