game project using unity

The game has 3 levels. The first level has one enemy, second level has another enemy and third level has both the enemies. I have coded for both the enemies . but both of them are now done in different unity projects. I need the freelancer to: 1. Set up the menus. I want the 3 levels to be connected. Like when player starts the game he must be shown "Play" screen and then it must be taken to level 1, when player finishes the first level goal he must enter the next level. When he finishes the last level he must be shown a "You won" screen. The game over menu is made already. Start menu is made already. "You won" menu is required for him to make. I just want the freelancer to revise the menu or see if there are any problems and connect them in order. 2. Put the enemy 1 in level 1. Enemy 2 in level two. Both enemies in 3rd level. Codes for both enemies are available 3. Goal have to coded. You have to collect 3 hyroglyphs. Each hyroglyph is a clue. The clues have to be used to solved a riddle. Each level has one riddle. The door opening is the goal. When the door opens the player must go to the next level. The first hyroglyph shows what object has to be collected. The second shows the order in which the objects must be placed at the door. The third hyroglyph shows example "press E to open the door" . The door must be opened only if the player has thoose objects and only if the player has placed those objects in order. I want the freelancer to just code for checking of the 2nd clue. I want three pots beside the door. when the player clicks on first pot he must be shown the inventory and he clicks on that and that object gets placed in the pot. Like wise for the other two pots. He may click again and choose the object from the inventory. I have the code for the inventory. Just the clicking on pot, choosing object from inventory and placing in the pot and checking if the correct objects are placed in the correct pot is required. Then only the door must be opened must be ensured.