CH From a personal standpoint, if I could give advice to someone who really wanted to have a successful card shop, it would be to love the Hobby first
Squirtle #148 Pokemon Stellar Crown Keep track of your collection value over time

Abandon the Post Abandoned Sarcophagus Abhorrent Oculus Abstract Performance Acorn Harvest Advanced Reconstruction Aerial Extortionist Alaundo the Seer Alex Wilder, Runaway All-Fates Stalker Aloe Alchemist Alrund's Epiphany Altar of Bhaal Alter Reality Ambush Wolf Amethyst Dragon Aminatou's Augury Amped Raptor Analyze the Pollen Ancestral Tribute Ancestral Vision Ancient Grudge Angel of the Dire Hour Angelfire Ignition Angelic Favor Annie Flash, the Veteran Annoyed Altisaur Anticausal Vestige Antiquities on the Loose Apex Devastator Apex of Power Appa, Steadfast Guardian Appeal // Authority Aquatic Alchemist Arc Blade Arcane Bombardment Arcane Heist Arcane Infusion Arcane Proxy Arcane Savant Archaic's Agony Archfiend's Vessel Archmage's Newt Ardent Plea Ardenvale Tactician Army of the Damned Arrogant Wurm Artful Dodge Artful Maneuver Arvinox, the Mind Flail Ashiok, Nightmare Muse Assert Authority Atraxi Warden Augury Raven Auron's Inspiration Aurora Phoenix Auspicious Starrix Author of Shadows Avatar's Wrath Aven Interrupter Azula, Cunning Usurper Back from the Brink Baron Helmut Zemo Bash to Bits Basking Rootwalla Battle Mammoth Battle Screech

Like most Pokmon cards, the value of Cubone depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Delta Species)