You can get bags on either eBay or Ali express, Chinese use them for the herbs going into soups or hot pots. Just put them in a bag either separated or not, if you haven't separated, they will once they are in the wort. It is important to cold crash, that will get everything to sink to the bottom, including the hop bag. The approximate freezing temps are. ABV 4 -2.3 C ABV 4.5 C -2.5 ABV 5 -2.7 C but unless you have every confidence in your temperature controller I would be taking 1 degree off those figures. Two to three days every thing should be pretty clear, and provided everything you have done in the mash and boil is right and have prevented any trub going into the fermenter you should end up with a clear beer.