Around when do follicles start forming? Having a US on day 11 will I see them there on the ovaries?

Yes, they should be able to see some follies growing. On Clomid, generally, a "mature" follicle is somewhere between 18-20mm or even higher and follies grow about 1-2mm per day. They will also be checking the thickness of the uterine lining (the endometrium). My guess is that you will see at least 1 follie probably around 10-15mm. Let us know the results!