Painting the backround (black) area is not that difficult, First clean the area real good with prep-sol or some Isopropyl alcohol let it dry. Then mask off the area that you don't want painted, (don't mask off the letters) pick the brand of black paint you wish to use Krylon, Rustolum, or other brands. Then the type,Flat,Satin,Semi-Gloss,Gloss If you use a spray can you are ready to spray. If you are using a (raw) 1/2 pint can you can use an artist brush OR if you have a air compressor you can use a detail spray gun ($13 to 30 depending on the retail store. I own several types of detail guns and they are the best investments for a DIY shop.) If you are using a brush, thin the paint to where it is not like glue but flows easily off of a Popsicle stick or plastic spoon. If you are using a detail gun thin the paint down in a separate container then pour it into the gun using a disposable paint filter and adjust the gun for the correct flow, pattern and air pressure.
Paint the entire area, then wait at least 5 minutes then take a small piece of rag dip it in some thinner get a small flat head screwdriver put it in the rag and go over the letters removing the the paint on the surface of the letters, you may have to do it several times to remove all the paint. but when done it will look great.
TIP When doing detail work using raw enamel paint i never use "Mineral Spirits" Its too greasy and does not dry fast enough. I use professorial mid temperature "Enamel Thinner" that the auto body shops use. It dries faster and does not leave any greasy residue, you can re-coat in several minutes and the work comes out fantastic !! the downside is that it costs $30+ a gallon. But considering the time saved and the quality of the work It's well worth the cost..Your auto body supply center has this thinner.
TIP If you do use the Enamel Thinner only use it to thin the paint ! For clean-up use the cheaper"Mineral Spirits" to clean the gun. and if you put the dirty mineral spirits into a container and let it sit for a week or so all of the paint will fall to the bottom and you can re-use the thinner saving you money...