Welding and Metalworking - new welder

Sorry for the long right up but im not even sure what im talken about never welded a thing!!
Hey every1 after sometime of figureing out which welder to get i bought a lincoln sp135t mig. So i unpacked and began reading it says to use fluxcore i need a kit, but i lookedat the gun and it already has the parts that are in the kit. the tip is .035 and it has a gasless tip on. So im assuming all i need is flux core wire. When i look up wire for it it says nr-211-mp. I found some places to get it but whats the diff between nr211mp and e71t? they both say .035 flux core wire? can i use any .035 fluxcore wire? it came with a 10lb spool of mig wire so im guessing a 10lb of flux core would fit as well. Thanks any good sites to buy these things at? looken fora helm as well dont like my handheld face mask.

Here is a link to the Lincoln Electric page for their flux core wires (no shield gas). It gives a description of each type of wire. The NR211MP is the trade name while the E741T is the AWS class. Both numbers are the same wire.

http://www.mylincolnelectric.com/Catalog/consumableseries.aspx?browse=104|13284|