Remember to date and label each item so that it is easy to identify later. Meats are often pre-packaged into family sizes. If you would like a particular meat and it is not available in a quantity you would like, feel free to ask someone at the meat counter to split the package. Most reputable markets will be more than happy to do this for you. You can do the same thing with loaves of bread.
Bread freezes very well and thaws quickly.
Just grab a couple of slices out of the freezer when you need it. Often, by the time you are done making your sandwich, the bread will have thawed. You can also defrost bread in the microwave. Most fresh produce can be purchased in small amounts, which is handy when you only need a small portion. However, some items such as lettuce can only be purchased whole so you may want to look for another option.