what era are you looking at for those characters you listed?
Past decade or 80s through now?
For good solo or Silver Surfer
-centric stories you need to hit the 90's. His solo title has The Herald Ordeal which is a great read. As are the Infinity War events. Danny Ketch Ghost Rider
in the 90's, up through about issue 50 is good material. Moon Knight
is fairly good up through about issue 40/45 if memory serves in the early 90's.
you're going to have to read New Warriors
. He hadn't yet regained a solo book in the 90's after having one in the 70's. I don't think you go wrong with the first 25 issues of that for sure.
Guardians of the Galaxy
90's really doesn't resemble the one Marvel has tossed at us currently. Some overtures but it's different. I really loved the first 25+ issues of that as well.
I don't know.
in the 90's was a mess. I dropped it, the art got bad and the stories very bizarre...even for Thor.
This decade though both the long running Ghost Rider
(36 issues) and Moon Knight
(30 issues) were both good imo. I even liked the shorter lived Vengeance of MK (10issues + Shadowland 3ish-mini) but admit some thought it uneven.
start with the JMS material when he brought Thor back after Dissasembled
in 2007. The title then goes back to the old numbering for an issue #600 gala.
hasn't really had much. He had a recent mini but it was nothing to say 'must read'.
I've not read any of Nova
but understand his part in the Annihilation War was crucial and a good character piece. Maybe someone else can chime in on that.