How could i get good props for a movie?

Improvise - it will expensive and dangerous to buy, commision use real steel blades - so I would buy some sheet plastic or rubber and metallic paint and build my own - use sound fx to make them sound like real metal. as for costumes again check your local thrift stores or buy some material and make your own - it'll be fun - good luck. you could also put some notices up at places where students learn costume design or fashion design and maybe someone will help you with the costumes that way.