Go into your ArcCatalog and create a new field in your attribute table. When it asks if you want it to be a "text", "double", "integer" etc... click the one that says either "link", "HTML", or "hyperlink".. I know, I wish I could be more specific, but you get the idea... its in there. Be sure to make its atleast 100 characters to save you trouble in the future. Then what I'd do is I'd go put all of my links together for that attribute. I'd put them in a folder of some sort.
Once you have your folder set up with all your information, simply open the folder. When the folder is open, in your "my computer" files (C:) or whatever server you are using.. simply copy that Url of the opened folder. Migrate back to your attribute table for your assets and paste that Url into the new field you created. Save your edits and click on the lighting icon (hyperlink tool). there should be a blue dot over the asset. Click it and it opens you up to that folder you just created. This will give you easy viewing of whatever document/file you need that is linked to that asset. I really hope this helps.
Let me know if you are still confused.