"Tactics" Game Design & Illustrations

Hey! I've been conceptualizing a game and could use your help. Please give me an estimate on doing a design document/fleshing out the story/ initial artwork for the following game: "Tactics" is a 5v5 tactical first-person shooter (FPS) game set in a near-future world where a powerful serum has altered the balance of power. Developed using Roblox Studio, the game features two factions—the Syndicate and Helix Industries (the Company)—locked in a covert war. Players choose unique characters with special abilities, engage in strategic combat across diverse maps, and customize their experience with a variety of skins and cosmetics. The main game mode would be a bomb defusal type game like Valorant or CSGO with mostly the same competitive systems. Where there would be a defender and attacker side. The attacking side would be the syndicate agents, and the defenders would be Helix Industries agents. The current full backstory is: A world on the brink of technological and biological evolution, Helix Industries, a global conglomerate, has secretly developed a serum known as "ExoGenesis." This serum unlocks latent abilities in humans, granting them superhuman powers. However, the serum's creation involved unethical human experimentation, leaving a trail of victims. A group of survivors from these experiments forms "The Syndicate," a covert organization dedicated to exposing Helix Industries' crimes and preventing them from monopolizing the serum's power. The Syndicate seeks justice, while Helix Industries aims to silence any opposition and control the future of human evolution. So the Syndicate sends 5 agents to a Helix Industries site. The agents must push one of three "data center" sites. There would be a main data center site, and one to two subsites depending on the map. Once the site is infiltrated, The Syndicate must plant a laptop and plug it in to the system to hack. If on the primary data center, it will only take thirty seconds to hack, if on a subsite, it will take 45 seconds to hack. The catch is that the primary data center site will be the hardest to push. The main objective for The Syndicate is either to plant the laptop and have it complete its hack to extract vital data on the serum/Helix, or to kill all opposing Helix agents. The primary goal for Helix is to either defuse the hacking laptop or kill all opposing Syndicate members before they can plant the hacker. On launch, I would like 2 - 3 maps, that are approximately valorant sized. I would like 12, 14, or 16 unique agents (half on the Syndicate, half on Helix's side.), each with 2 primary abilities and an ultimate ability. I would also like around 15 weapons. 3 AR's, 2 SMGs, 4 pistols, 2 shotguns, 2 snipers, and 2 LMG's. I want a 5 v 5 skill-based matchmaking 'ranked' game mode, a 5 v 5 skill-based matchmaking casual game mode with abilities, gunplay, and the laptop. Then, I would also like 4 v 4/ 3 v 3 / 2 v 2 / 1 v 1 game modes that are Soley gunplay and ability based. No laptop or defusal. The competitive mode would be round based and the first to 12 rounds win. First 12 rounds are played on either the Syndicate or Helix side, then you switch for the final half of the game. So first 12 rounds you would be playing one agent, then for the ladder half you would switch to another. For how the ability system works, I would want it almost exactly like valorant. They must be purchased except for the ultimate which is earned. I would also like weekly skin releases for the game, a in game currency earned by playing, an in-game currency that is purchased, and possibly a battle pass system. For the agents, I want them all to be unique characters with unique backgrounds, I also want voice lines for all of them. I want cross play between PC and console, but not with mobile. This is all over the place as I was going off the top of my head. But hopefully you can understand what it is I am searching for and give me an estimate on your services. Thank you.