Congrats on your new planer. Even though you don’t have jointer, you can make a sled that will allow you to plane a boar or plank on both sides and to get an even thickness. If you search the web for planing sleds you will probable find a lot of them. If you subscribe to Fine Woodworking website you can search for one there as they had an article on one some years ago.
Mike, an American living in Norway