Is there any benefit to turning my Coupons for ingame stuff in after I've progressed a bit in the game?

I just bought the Explorer's Package of Black Desert Online which comes with a couple of ingame items/boosts. I noticed those appeared in form of redeemable coupons in my account. So I'm wondering if I should activate those right away or if it's wiser to wait until I've progressed a bit in the game to get the full value out of them.

For example, do the horse/pet/items I receive from the coupons have stats that scale with the player's level? Will activating those coupons right away fill my storage with items I can't really use right away and clog up my inventory? I'm wondering about stuff like this. Not really sure what other possible downsides there could be, so I'd appreciate any active player to give an answer that will help me get the most value out of the extra content. On the other hand, is there anything I should activate right away?