Start GTA SA and Load the game. After that follow the instructions to do the following tasks:-

1. Cheats Menu

Press "CTRL+C"

2. First Person

Press "V" or "Home" button

3. Recruit Foot Clan

Spawn Foot Clan from the cheats menu and press "G"

4. Skin Selector

Press "Tab+Q" or "TAB+ E" or for menu "TAB+Q+E"

5. Weapons Menu

Press "2"

6. Weather Menu

Press "M"