Hello Patt!
You may want to search the forum here for additional info on this subject. Look for the Brochure thread, contract, and possibly others.
Anyway, I can share a bit of what's worked for me. I'm sure there will be other stories, and perhaps differing opinions.
First to start, being a part of a "professional" group is fine, I don't think it can hurt. I for one, don't even mention I'm a member of ASOPA. It hasn't hurt my business any. (I just forgot to include it actually).
Your first concern is to make your work as strong and cohesive as possible. For me, my target market is Families, and I focus my 'stare' (advertising efforts) on venues where I can reach them. However, prior to this, I worked hard on presenting an advertising package.
My process went like this...I decided I wanted my brochures to be of a permanent nature, that is, not changed for several years. I have a website, and use this for updated work, and reaching clients outside of my area. My brochures include a logo, (my identity) which carries over to stationary (letterhead, envelopes, business cards, notecards). It is also included in my website. All the elements relate and are designed as a whole. I wanted all these pieces to looked as polished as possible. I know my limitations, and sought professionals in graphic, and web design to do the work. I paid for their services with cash, as well as bartering. The graphic designer was paid w/ a portrait I did, the printer w/ a landscape for their lobby, the web-guy, cash. Total cost and time is extensive, but I feel worth the price. I look professional (may not act it, but hey, another story..kidding..)
Mind you, Pegg, this took several years of plotting. I was very goal-oriented and focused.
Back to target market. I started donating to high-end fundraisers that draw affluent people. Displayed a portrait, and included my promo material. Worked like a charm. I do these 2x a year. Because of that, and referrals, I'm booked until December.
It sounds like you've made some strides in your community. Focus on what you want to specialize in, and hunt the crowd down. Go to the next town over, and introduce yourself. Be clear on what you do that makes your work special, and don't apologize for your prices.
We artists are here to remind people of beauty again. Be proud of that, not everyone can do it.