What do you do after you analyze a table? It did not seem to give me any information after I did so.
You don't need to do anything after that. Analyzing a table provides information to the database so it can more efficiently run your SQL against the tables(s) that were analyzed.
However, Toad for Oracle does create a nice summary of objects' stats once you've analyzed your tables. Choose Database-> Optimize-> Analyze Objects (from the pull down menus) to see useful analyze stats and related info for your list of tables.
Is there a way to figure out where you should add index's from this information?
Not really, except that perhaps there is no need to create indexes on tables that don't have many rows.
Look at the "where" clause of your SQL. If there are some conditions in there on some selective columns (meaning, lots of unique values in these columns - look in the result for analyzed columns), then those columns are candidates for an index. There's more to it than that, but that's a good place to start.