When meats are cooked or roasted in canning factories, the juices are often sold in various forms for flavorings. Such meat extract was used by the early microbiologists for convenience. Nutrient broth and nutrient agar made from such products is the most widely known media to teachers and students. However, media based on tryptone are more complete and support the growth of more species of bacteria. Use hankerchief or any thick fabric to filter media, not cheesecloth.
Grams means grams per liter of medium.
Thus, 10g sucrose means 10 grams of table sugar per liter of finished medium. See Useful Conversions for tablespoons, pints, etc. Dissolve salt in water, if it is cloudy do not use it. I add salt only when I am duplicating a classic experiment. I suggest you omit salt.