To create an ordinary manga, you need to think about everyday situations and emotions. Use basic drawing techniques and don't go for overly fancy or complex plots. Also, make sure the characters have normal, believable problems and resolutions.
Well, start by researching popular alpha manga series and see what makes them appealing. Also, follow manga forums and communities to get recommendations.
First of all, for the transformation, focus on having a normal daily routine and facing common problems. Also, avoid fancy outfits or special abilities. Just be someone the readers can easily identify with in their own lives.