I don't have SOLIDWORKS PREMIUM, so I don't have access to the Tool Box. So I need to design my own.
Solidworks tutorial | How to make Helical Bevel Gear in SolidWorks
There are many different web site where you can get 3d cad model of spur gear, helical gear, miter bevel gear etc. Here is an link where you can filter your required model.
How to select gears | KHK Gears
the SWX Toolbox is part of the Professional package. You don't need to have SWX Premium...
DO NOT use Toolbox gears for anything more than a rough visual representation. They are not even close to being accurate. You would be much better off finding one from a vendor site or modeling your own.
Please do share the results you come up with (your model or the sites you use).
What is your purpose in modeling a gear? If you plan to just buy the gear or send the drawing to a gear maker who has the proper equipment, there's no need to try to model the teeth particularly accurately. If you really need accurate involute geometry, there are quite a few threads here that deal with that. Do a google search (forum search sucks) for Solidworks involute gear
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