For your first design, the gaming one - you'll need to read the conditions of use as you're not allowed to resell it on again. You may need to contact the original design company to check if you can do so with their permission (remember to get written permission!)
ANY DISTRIBUTIION, RESELLING, PUBLISHING of the source code of the template(s) is STRICTLY PROHIBITED. All Image, Music, and Animation File(s) used in the source code cannot be re-distributed separately in any other format. You may not sub-license, assign, or transfer this license to anyone else without prior written consent. You may not claim intellectual or exclusive ownership to any of our products, modified or unmodified.
I just wouldn't like to see it sold on then the new owner not being able to show proof of sale from the original designer if ever asked to do so