the mold you are considering
Makes one of each size . Which is good for someone just starting. If you stick with it in the future you will be wanting to pour more of one size.
Size of jig will depend on when and where and what you fish for. For example since I icefish I pour quite a few smaller jigs 1/32 oz and under. Walleye fishermen usually use an 1/8oz and up.
I pour three major types the round head no collar, minnow head and the pony jig. Due to Snake River's pictures of his fine looking jigs I just bought a tapered tube jig mold that casts 4 - 1/32 oz and 4- 1/16 oz.
I find it hard to argue with the 1/16 oz in any configuration. Only thing it may be a tad big for bluegills but seems to slay about everything else.