He means when you type the TITLE of the mission(s) you should use the form: [SnP] mission name(s) [V1] as indicated in the banner.
Body armour is also available:
Under the bridge behind Sweet's House, In an alley south of the park across the street from Zero's Shop, at the North end of the Runway in Los Venturas, Under the Come-A-Lot casino sign across the street from the Four Dragons Casino, In a hanger at the Los Venturas Airport. In most Police Stations, In the SWAT truck. Also, on a stairway at the rear of the Huge Factory in Blue Berry, et cetra.
There Are HUNDREDS of FREE weapons and body armour if you spend time exploring.
You only need money to buy Safe Houses (buy them all) and in certain missions. EXPLORE.
Safe Houses are useful to get rid of wanted stars by changing a shirt.