If your account is linked to an organization that has ArcGIS Software on maintenance there will be many more resources available to you.
If not, as Dan mentioned before you can see some videos on Youtube and for instance this video came up: Terrain Analysis Exercise 1: Calculating Terrain Attributes - YouTube (when I searched for "terrain analysis ArcGIS"). Although it references a tutorial related to LiDAR data, you can see how slope, aspect and other products are derived.
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I don't have a video of that process, but the steps would be very simple. The problem is that the file that you have does not have valid data to generate the slope map. Unless, you have a different data set now (a lot can happen in 7 months).
Can you share the location of the raster? It would be best to ask those that provided the raster what coordinate system has been used to avoid having to guess the spatial reference.