I am aiming to create 5 new designs every day so i can build a portfolio of listings. From someone with experience am i better stacking up my designs to drop in bulk or list as i go. As well as that for advertising is it worth starting my advertising as soon as i list my 1st product or wait till i have a sufficient amount of products to sell before starting my campaign. Any help would be appreciated.

Hi looking to create a mockup for my banner for my store to include some of my designs. It was recommended in the classroom videos however i am struggling to find a suitable mockup with the correct pixel dimensions. Is this possible without photoshop ? Any help would be appreciated.