Congrats on your first post! To sell completed makes you would have to make a journal for them, journals are only able to be made from patterns that you own here on Ribblr, there’s currently no way to sell plushies/makes made from patterns outside of Ribblr
Also something I do whenever I can for newcomers 
if you ever need help never hesitate to ask in the community, if you need immediate answers feel free to use the help center, search in the community, or the wiki [link below] and community guidelines if needed Happy crafting! Hope to see your crafts soon as well