With the story that began in Superboy and the Legion of Super-Heroes #258 and ended in Legion of Super-Heroes (v2) #259, Superboy was effectively fired from the Legion. The group that owed its entire existence to its "lead," basically kicked him out of his own title.
Superboy as a comic-book series made its debut in March/April, 1949 as another way to sell Superman comics to the kids. Superboy didn't even appear on the cover of his first issue!
|Superboy isn't even billed on the cover of his debut appearance!|
|The splash and last page of Superboy's debut (More Fun #101)|
|art by Superman creator Joe Shuster|
Similar to how Superman's stories quickly established and settled around the Daily Planet in Metropolis, Superboy's adventures quickly established the parameters of his life: Smallville, Lana Lang, Krypto, Pete Ross, and Ma & Pa Kent. The Kents made their debut with Superboy in More Fun #101, but did not really take center stage until the series moved to Adventure. Lana first appeared in Superboy #10 (Oct 1950) when the Langs moved next door to the Kents. Krypto made his debut in Adventure #210 (March 1955). Pete made his debut in Superboy #86 (Jan 1961) as "the new boy in town." After Pete learned Superboy's secret (Superboy #90, July 1961), there were basically no changes to this scenario for the next twenty years.
To read Superboy's earliest adventures, some by Jerry Siegel and Joe Shuster, pick up the first collection. To read some of Superboy's team-ups with people like Oliver Queen and Aquaboy, pick up the second collection.