Now there are tons of videos online and one of my favorite is the pansy from Art of Teresa
I have adapted this pansy and used just the first part inner flower to make a single flower and stitched a button in it.
Link to Teresa's video
Instructions I wrote down from that video
Now this is easy.
Do the same as in steps 1 - 3 ie just one color (do not need step 4) but instead of chain 2 to rise do chain 3 to rise and instead of double crochet do triple crochet. That way the flowers are a bit bigger and the small buttons then can look nice and not too bog for the flower. Leave about 5 - 6 inches of thread in the end before cutting and bring that thread over to other side with needle and stitch the button in and then take the thread back. In the flower I don't cut of the ends till the last as I just knot the threads together twice and then cut off close.