The link I gave explains the difference between the two type of images. If it is a vector file you need, you will have to learn how to use the pen tool and at least have an understanding of paths, anchors and handles. Once you have researched this, you will be able to manipulate the paths into the required shapes. The brush creates a raster image.
I got this from an engraving website I have used before:-
You need a professional vector graphics program to open the vector file. We recommend that you save the file first, then open it with the appropriate vector program (Adobe Illustrator CS4 for example or CorelDraw X4 as is our preferred software).
Double clicking on the file may prompt your computer to open the file with another program thereby changing the file’s initial format. Instead, open the program first, then open the file. Opening the file with a “raster” program like Photoshop will “rasterize” the image and the file will be of no use to anyone requiring vector line art. Opening the file with a PDF reader may change your eps file to a pdf file instead. If the vector file was requested by a third party and you do not have vector graphics program, simply forward the attached file or save the file to disc. EPS is the preferred file format for most engraving machines.
Simply embedding a photo (jpeg for example) into a file and saving it with an .eps extension will not turn your image into a vector line graphic.
I use a lot of printing companies, and they always have trouble opening .ai and .eps that have been saved in photoshop. I don't know why.