Welcome we are glad to have you! That certainly is odd gallonage for a tank lol.
The answer to the plants: yes you can! As long you have a light on the tank there is a few plants that will grow in almost any tank. Anubias and Java Fern are great starters. Amazon swords are easy too as long as you put a root tab under them to help root growth.
Fish: yes you have room! Www.AqAdvisor.com
is a great recourse to help stock your tank. I went with the 14g bio cube since you said 13. Says your only at 57% so a school of harlequins or zebra danios would be cool!
Hope this helps!
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