When it comes to the many types of suppliers that you can choose from, you have many things that you can do in order to figure out which one you need to order from. So, let's look at a theoretical scene in which you're a fast food restaurant owner.... and what supplier will you need for each different facet of a business. This will give you a better idea not only of the types of suppliers that you need for each restaurant, but also in any business.
Uniforms. They won't magically pop out of the ground by themselves. You'll need to have uniform suppliers to create the uniforms that you have in mind. While you will have to come up with a logo, they'll end up doing most of the hard work. However, if you're not in business, they're also losing business. You'll need to also keep up with your suppliers, any payments that you may have due to them and the like. This could also include laundry, depending on the services that the supplier offers. You'll have to find out more specifically from them once you get the chance.
Food is important. You want proveedores (suppliers in Spanish) that have a good reputation, are known for their food quality, and are sure to deliver on time. You'll want to talk with other companies (that are friendly and not competing) to see where they like to have their food delivered from and then go from there. Make sure to research it as well! You have a lot of options as far as food goes, but you need to keep in mind that you'll also have to find the best supplier for you. There are LOADS of different foods that you'll need as well, including the beverages!
Even if you're using plastic, you will still need to have your dishes up and ready to go. Not to mention that nine times out of ten, your customers will want to leave the restaurant and go eat at home or another area. It's nothing personal—it's just a little bit easier. It's one of the best reasons why you should have a constant supply of food packaging at your disposal; who knows—maybe you'll have more take-out than you might have thought beforehand! Again, when it comes to your suppliers, you need a good, reliable supplier that has all of the materials ready to go.
And, of course, when you get down to the last few suppliers, you'll see that you really, really need to have your storage all sorted out. This is one of the most important things to remember, especially when you're looking for a great way to get everything reasonably squared away and ready to go. You have many, many ways to store your products and your packaging and spices and dry ingredients that don't need to be refrigerated. Keep all of this in mind while you're looking for a proveedora (supplier in Spanish) that isn't quite as expensive as any others that you might have in mind.