So if I have this right, you have phone, cable and internet in your home. You want to extend those services to your workshop 100' away?
Well, for internet you could get and run outdoor rated CAT5e cable between your home and shop. Actually, if you're going to bury it, you may as well future proof yourself and get CAT6. I'm of the mindset that if I'm going to do some digging, I don't want to come back in a few years and pull a new wire because I got some new fangled top speed internet that the old cable can't support. It's only about $10 difference between the two I've linked below anyways.
For TV, you could again run some RG6 coax from your house out to your shop, be mindful that you may suffer from some signal loss in doing so, and if that happens you'll need to add an amplifier to your coax line to your STB in your shop. I forgot how much the signal degrades per 100' but those figures can be Googled easily.
Home phone has me a little stumped, I don't know how much signal loss can occur, but what I've seen, outdoor RJ11 (phone cable) is pretty pricey. You could save money if you ran both CAT6 and phone cable in buried tube, you'd just have to ensure no moisture got in the tube.
Found some prices on amazon for outdoor cabling:
500' outdoor CAT5e
500' outdoor CAT6