When upgrading or building a network/hardware list from scratch, it is essential to know what information you need, who you are designing it for, and how you wish to present it. Here is an example document I created showing each part of a new network and hardware build, with multiple options for some of the larger items (in green). In this sheet, the items needed for moving current employees over to a new building are included, while the items that what will be needed to scale the company and add additional employees are in a separate sheet entirely; this makes it easier to create and plan the two stages of this process: the initial move and then the company’s expansion.
As it is can be hard to read in this format, here is a link to the image.
If you are creating this list for your boss, you may want to use images and terms that are simplified. Typically, your boss just desires a rough idea of what items will be required, how many of each item you will need, and the cost of each item individually/total cost of all required items.
For more expensive items, it is an excellent idea to provide multiple options in the order of good, better, and best. What does this mean? Well, your first proposal of an option for an item should be the cheapest (but still sufficient) model. From here, you want to select the next plausible upgrade, and finally, what the high-end model will be. Creating your list in this format allows your manager/boss to decide where he/she wishes to allocate the most funds. Be prepared to have a detailed argument for each item with examples of how each device will operate compared to the others.
As you might just be an IT team member, you will be tasked with installing, optimizing, and repairing these items, So, spending time researching the strengths and weakness of your suggestions can enable your company to purchase more expensive and better-performing parts, thus making your job much more manageable. Hope it helps!