Short answers, pulled from the story.
Star Comics launched in July 1984 to capture young readers after Gold Key Comics closed its children's line in 1983. Marvel created the imprint because it had struggled to find success with licensed properties like Rom The Spaceknight or The Smurfs.
The first comic published under the new imprint was a three-issue adaptation of The Muppets Take Manhattan released in July 1984. Subsequent releases included adaptations of animated series such as Fraggle Rock, Heathcliff, Planet Terry, and Strawberry Shortcake during the first month of ongoing releases.
Peter Porker The Spectacular Spider-Ham emerged as one of the most recognizable original creations from Star Comics debuting in 1985 with a distinctive visual style inspired by Harvey Comics earlier work. Artists Warren Kremer and Howard Post contributed significantly to these early efforts helping establish a consistent look for the line.
Harvey Comics filed a copyright infringement lawsuit against Marvel in late 1985 claiming that Royal Roy was a blatant copy of Richie Rich. The legal battle forced Marvel to cancel Royal Roy after only six issues had been published before the suit appeared in The Comics Journal #105 dated February 1986.
Marvel dissolved the Star Comics imprint by the end of 1987 absorbing several remaining titles under its standard publishing program. The final issue under the Star Comics name carried a May 1988 cover date though the digest-sized Star Comics Magazine persisted until December 1988.