Video game ideas?

Well... I myself had always been a fan of Mount&Blade, Half-life, and... this and that. I have so many ideas that I am actually trying to do my best in order to get a job as a video-game writer, since I like doing lore and story. I had designed this concept that I don't share with anyone but my closest friends, because I thought about it and designed that crap so much all that remains is to sit down and make the game. I just need to know whenever I would turn this concept into a game, or a novel or comic :/

A shareable idea is a multiplayer top-down arena fighter, kinda like the Arena fights in Mount & Blade, called it "Manly Medieval", with fightning mechanics akin to GBA Legend of Zelda games, but with tons of customization and mutators for fights. The most basic and vanilla of fights would have wooden weapons of "Light" and "Heavy" classes, like swords, spears, maces, bows... "Light" weapons are quick, but not really damaging, but light melee weapons can be paired with shields. While heavy weapons are slow to fire but deadly, and only the lance, when on horse, can be paired with a shield. Plus, three types of shield: buckler, round and tower. Buckler can bash, and tower shield has max protection. I did a lot of math (I suck at it btw) around balancing the stats, and I have them written down somewhere... Other than that, customization levels would reach real-life historical battle recreations. A Mount&Blade inspired game should always support modifying and customization, a lot of M&B mods are "historical recreations" of certain eras and times in history after all, so I reckon muskets and cannons should be the first mods ever made, should the game be made. Graphics? MS Paint-able, like Minecraft. I know I would risk having to deal with penises and swastikas, so I guess it would be cool to have some vanilla dedicated servers with varying mutators, or no mutators at all, that wouldn't allow custom player (fore)skins