Fill up any open spaces like empty corners with soft things, pillows, sofas etc. This has a few benifits, gets rid of echos from corners or hard walls, the soft things absorb sound, and you don't have to spend loads of proffessional sound proofing materials, which is basically foam
Put egg cartons on the walls and then put carpet tiles over them. This combination will muffle sound and stop vibrations from moving through the walls. To soundproof the floor, get some floor insulation under your carpet, and then try to put your speakers on stands or raise them using cardboard boxes to minimise vibrations from the speakers traveling through your furniture.
my bedroom is like a basement room so its underneath everyone else so floor insulation aint gonna be much use but cheers anyway, dont want egg cartons on my wall will look a bit messy not that my rooms tidy