Franx131YT

Hello, Im new at minehut and i've seen good servers and i tried to make one. Now i'm making a server, I've seen a cool plugin called "skript". I don't know very much of how to skript and now I need some help with a skript to receive random items every 5 seconds. But i don't want the skript to give ANY item, Only: Oak planks, Cobblestone, Iron ore, Oak Sapling, Bamboo, Grass block. But some of them are rarer to get than others. (25% are the odds to get cobblestone, 10% are the odds to a grass block, etc) You can put any percent you want.