What are your EXPECTATIONS, and GOALS for this build?
Basic computer, yeah. Good for Minecraft, Poker, and other light gaming sure.
Want to play PlayerUnknown BattleGrounds in 1080P 60FPS? - NO WAY.
If your budget is $300, you best BANG per dollar is head to Gamestop and get a Refurb PS4. Not only will it play all GAMES current and NEW, but play then AS ADVERTISED, most in 60FPS, and very nice graphics. PLUS you get a BluRay Player, Vibrating Wireless Controller, Mike headset, etc. which is (I priced it for PC before) about another $400 onto your build for the same stuff.
If your PC gaming, the 'standard' system is a i5, 8GB RAM, 1TB Drive (best with a SSD for the OS), and 1060 or better (can drop down to 1050Ti if need be) and be around the $700 price mark to achieve 'normal' expected game play performance.