One is for jobs that specify multicolor paint. The other is where you get to play the role of consultant and designer. Both are going to require some marketing effort. You have to be aware of jobs that specify multicolor paint. Telling people what you do only once is not enough.
Repetition is the key to success in direct-mail promotions.
The object is to make people remember your company name and the new service you're offering. The letter will require the least time to produce and the brochure the most. You can be preparing the brochure while getting the letter and flier in the mail. Space out these three marketing missives about 30 days apart, and within about 60 days you'll have told everyone who should know about your new service. You don't need a formal in-house marketing department to do this.