Taking a Photo
Let's talk a little bit about the photo that you have to shoot of your product. You need a photo to make a cutout with for this project. You can have more than just that one photo in your ad, but at least that one photo is required. Part of making this advertisement look legit is taking a solid looking photo.
One of the most important things you can do make impressive photos is to use good lighting. Lighting from one side will leave a shadow on the other side of the image. Lighting from both sides will leave no shadows. I would avoid using a flash for your lighting. Often the flash will make the photo appear washed out and drab. These tricks will go a long way for showing off your product.
While shooting, I would take a bunch of shots. Work a few different angles and perspectives too. You might have one thing in mind for your ad but as you look at the photos you've shot, a specific angle may really speak to you. It's always better to have more to choose from than less!
Now to make the selection easier, consider using a one color background. It shouldn't be the same color as the object or it could be difficult to determine where the edges are. You've no doubt seen or heard of people using green screens for this reason. Seldom does a weather person or most people for that matter, wear that bright electric green color of the green screen so it's easy to make the selection and not interpret the green as the object.
Of course these are just suggestions! I'm just telling you things that I have seen work for me in the past. Feel free to do you own thing.