@Kelly M.
Thanks for following. Your questions below are followed by my answers.
1. Do you attempt to use colored envelops or letters to be more eye grabbing?
The letters are yellow, but the envelopes are white. The print appears to be handwritten on both the letter and the envelope.
2. I am establishing a Facebook page and website page to try to be more credible. Have you done of this? Would you recommend this?
I have no feelings either way other than if I come across an entity with a facebook page and no website they actually lose credibility points since for the same amount of effort a website can be created. Frankly, I have no web presence and have no plan to get one. I work full time and buy rentals on the side. My credibility comes in the proof of funds and cash to close.
3. I have created a brochure, again an attempt to provide more legitimacy to a small company. Do you think this worth the bother?
No. Not even a little.
4. Do you think 7 NEW letters per week is too little to be successful? If I repeat this 3 times over 3 months, it will turn into 20 letters per week.
Probate is a super niche market. There are a few experts in these forums that could tell you, but you have to mail, and mail, and mail, and keep mailing to probates because you never know when the executor will be able or ready to sell the property. I don't have much experience with probates to be honest. I dump letters monthly to the same non-owner occs with equity in the neighborhoods I want to buy in for 6 months in a row and then I refresh the list ad mail 6 more time. I've been mailing 500-1000 letters a month for the past 4 years and average about a house a month. Some are killer deals and others barely meet my buy and hold criteria. It is completely a numbers game (and a people game). Since I started mailing, the market I am in has gotten hotter and hotter.
Hope that helps. Good luck.