OK. You need to find the centre of the fabric, you can mark it with a little bit of running stitch with cotton or a bit of the embroidery silk, just a little so you can find the centre again. See those little arrows on the edge of the pattern? They mark the middle of the pattern. Put your hoop on the fabric and you'll start embroidering from the middle of the picture, that will ensure your finished embroidery is in the centre and you don't end up going off the edge!
Each little square on the pattern is one cross shaped stitch. You'll also have a list of which shape = which colour. The easiest way to keep track if you don't have a pre printed thread holder in the pack is to get a bit of card, like the side of a tissue box, and punch holes in it with a hole punch. Then you can loop each colour through a hole and draw the corresponding symbol against it.
Read the instructions and check how many strands you should be using for the sewing, it's usually 2 or 3, there's 6 strands in each thick strand as it comes in the pack.
The easiest way to keep track of what you have done and where you are is to cross through the stitches you have done with a hilighter.
Dont tie a knot to start off with, just leave a tail on the back and then sew over it as you do the next stitches to hold it in place. The stitches you do in the front / right side will be diagonal, to make the crosses. The ones on the back / wrong side should all be horizontal or vertical. That will mean your finished work lies flat when you frame it with no lumps and bumps. It takes a bit of planning to work out how to sort of navigate around with only horizontal or vertical stitches on the back, but you'll get the hang of it really quickly. Once you've got the first bit started, you can weave the start of the next silk into the back of the stitches you've already done.
If you are using an even number of threads can fold the silk in half to double it up, and have the loop on the long end, when you do the first stitch you can put the needle through the loop on the back to hold it in place rather than weaving it in.
On the hoop, put it over the centre, when you've filled in all the hooped area, take it off and move it. Be careful not to tighten it too much on top of stitches you've done or it may squash them. You can wrap some scrap (white) fabric round it to act as a bit of a cushion if you like.