No, there is not any type of Halloween jackolantern stencils since all jackolantern stencils do require candles. Candles help to light up the hard work put into creating a jackolantern.
You can buy spray paint stencils and a number of other stencil designs at Stencils Online. Also, you can customize your spray paint stencils into any design or logo you want. See link below for details.
The candles on the Menorah can be of any color.
Dollar General does indeed sells stencils for pumpkin carving. In fact their entire store is geared towards Halloween merchandise in October and you must can find what you need.
Any significant difference exist.
Yes, you can print a jack-o-lantern stencil at family fun, ABC family, Martha Stewart, all about stencils, Squidoo, and any other craft site that allows you to print off the stencils.
any candles can be hanukkah candles, as long as they fit in the Chanukiah (Hanukkah menorah) and burn at least 1/2 hour.
Someone can buy stencils for wall art at most likely any home arts and crafts store such as Michaels Craft store. Michaels is a chain craft store, but most mom & pop shops should have them as well.
Any candles that are big enough to burn for one-half hour or more.
They can be any color.
Pumpkin stencils are easy to use if you have worked with them before. Just like any other tool, you would have to feel comfortable with using that tool. If you're not comfortable with using a stencil, then I suggest that you stick with the butter knife.
The best website for jackolantern templates is at jackyourlantern dot com. They have many to choose from and you can save and print them. Then you can carve away.
Probably just a different color of wax.