to the shop.
First a little about nomenclature.
Modem: A device that attaches to the incoming cable/telephone wire. Usually only has one ethernet connection on it. Some modems are also routers, in which case there will be more than one ethernet port on it. (usually 4 or 5)
Router: A device that takes the one incoming line and converts it to, usually, 4 separate ethernet connections. This device can either be just a plain wired router or a combination of Wireless and Wired.
If your house modem is a combination one, you could use one of spare ports and run an ethernet cable from the house to the shop. 100ft is well within the ethernet length limit.
As you have expressed a desire for wireless in the shop, connecting a wireless repeater to that ethernet cable would do the trick. Not a router, just a Wireless Appliance. (WAP)
Another option would be to use something like Ethernet over Power. This is an example, https://www.monoprice.com/product?p_id=12287
You would need two of these, one at each end, plugged into your house/shop electrical circuits.
It will NOT provide wireless in the shop, you would still need a WAP.
You would also need a Router in the house if you do not have such a thing already.
Hope that helps a little
How do i get internet to my shop, the modem is in the house, about 100 ft or a bit farther. Do i get a different modem or do i just need the one to wire it into the shop. There are no windows or anything like that in the shop. And am i also set up wireless in the shop once it set up and will it be able to work like that.