Wooden embroidery hoop. Available cheap at craft stores. Not recommended for use while embroidering, but pretty for framing purposes.
Felt for backing. Synthetic craft felt works just fine, but if you have nice wool felt you can use that too. Other fabrics are possible, but it must be something that doesn’t ravel.
Fine tip permanent marker.
Shears. Regular shears (or scissors) are necessary. Also having pinking shears is suggested.
Hot glue gun.
Position your embroidery in the embroidery hoop. Use pinking shears to pink the fabric 3/4″ from the edge of the embroidery hoop. Pinking isn’t absolutely required because you will be gluing the fabric in place so there is essentially no opportunity for it to unravel, so you can also use normal shears to trim to size. If you are terrified of your fabric unraveling you can also serge around the edge, run a small zig-zag stitch on your sewing machine, or use fray-check on the cut edge.
On the reverse side of the embroidery, run a small line of hot glue along the inside of the inner embroidery hoop and press your fabric down into it. Only add a couple of inches of glue at a time so that you can work slowly and carefully without rushing and worrying about the glue drying before you get your fabric in place.