For the next step up in convenience, consider adding a dedicated beverage cooler to your workshop as well. Though many people set up an old refrigerator in the garage for extra soda and beer, a dedicated mini-fridge will help you save on electricity, since new models are far more efficient than old ones. You can pack your beverage cooler with your favorite soft drinks for a pick-me-up while you work or use it to store a lunch to enjoy on a break —all without tracking dirt and or grease into your clean kitchen.
This will be a personal matter, depending on whether it will be helpful for finishing or sharpening. However, it is a good idea to look beyond your current use of this space to the next owner. Would it be beneficial to add plumbing hookups so that the shop could someday be an apartment, or an art studio, or an extension to your house? It could add to the resale value of your house to be able to create as flexible an area as possible by roughing in a bathroom and even a kitchenette area if you can. If this is done when wall cavities are open or before the slab is poured, your forethought could pay dividends but not cost much up front.
If you work with rough lumber, a planer will be absolutely necessary, except for the most rustic of projects. Every piece of rough cut lumber ends up somewhat not straight, not flat and not consistent in thickness, either from variations during the sawing or from stresses which occur while the wood dries. The planer, combined with the jointer, is a one-two punch to remove these variations and produce straight, flat and consistently thick lumber. The reason the planer is ahead of the jointer on this list is that some lumber is straight enough and flat enough to plane without jointing if the job is a little less finicky, thereby skipping the jointer.
Personally, I think it sucks to have to lug massive pieces of rough lumber and 4′ x 8′ plywood sheets all the way across a shop. Much respect to basement dwellers who have little choice in the matter. But for those with garage shops, you should think about storing your sheetgoods and solid stock near an entrance. This way when you come home from the lumber dealer, you can back up your vehicle and quickly load the stock into the shop.
Let’s be clear about one thing: No workshop is perfect for everyone. If there were, I could simply give you a precise plan to follow with clear dimensions. Every person who comes to the hobby, avocation, or profession of woodworking has his own particular collection of tools and his own peculiar work style, skills, and desires for the kind of woodworking he wants to do that gives him a unique approach as to how he will lay out a shop: where the tools should go, where lumber and supplies are stored, and how much bench area he needs.