It was announced at New York Comic Con that Star will be getting her own mini-series which is pretty big, character could see a big spike in popularity if the series turns out to be popular. In the meantime though Captain Marvel #8 which is the first appearance of Star in costume has seen an increase of 500% copies sold and makes it the Top 1 hot book this week.
Issue could gain quite a bit of value if she becomes a big character, similar to what happened to Kamala Khans first appearance where graded copies of that sell for between $500-800. Also a graded copy of Captain Marvel #8 just sold for $80 which is crazy. Star's first appearance was in issue 1 but her first in costume appearance as Star was issue 8, also the 2nd printing of issue 8 is also her first cover appearance so a good book to look out for.
Issue #1 has 2 covers so far, the first is by Carmen Carnero who also did the 2nd prinitng cover of issue 8 and the variant cover is by Jeehyung Lee which is the one I will be picking up. Issue #1 comes out in January 2020.