Re: How to correctly remodel bedroom floor
You will want to use tongue and groove plywood, laid perpendicular to the joists. Current day philosophy is to use construction adhesive between the plywood and joists in addition to ring or screw shank nails. If you don't use T&G plywood, then you'll have to install blocking between the joists to carry the joints of the plywood.
Once the plywood is down, you'll want to install underlayment to provide a smooth surface for the vinyl. I've always used 3/8 particle board for the job, others prefer plywood or underlayment products.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!