Among your first stops should be Inverness Visit Scotland Information Centre. Here, you'll be able to orient yourself and get some great ideas before you begin exploring.
This tourist information center in Inverness City Centre comes recommended by many travelers, so make sure it features on your schedule. Don't think that's all there is to do here, though. There are loads more spots ready for you to enjoy after Inverness Visit Scotland Information Centre. Inverness Castle, Culloden Battlefield, and Inverness Cathedral are nearby.