Custom GTA5M Roleplay & Freeroam Server

I already have a Windows host ready and I want to turn it into a fully-featured GTA5M playground that blends serious Roleplay with relaxed Freeroam. The goal is to let players swap seamlessly between earning a living and cutting loose, all on one stable, well-optimized server... (Budget: $250 - $750 USD, Jobs: Game Design, Game Development, Game Optimization, Game Programming, Inventory Management, Performance Tuning, Scripting, Windows Server)