Starting a Yellow Letter Campaign Advice Appreciated

Starting a yellow letter campaign.  Any Input Advice Appreciated.

I bought a list of homeowners off listsource with the following parameters.  I think Sean Terry said these parameters.

City near me.
Total Assessed Value 0 to $100,000 - first 100 aimed at the $50,000 to $100,000
Property TypeResidential: SFR
Length of Residence10+ Years
(Household) Age65+ Years
ADDRESS-COMPLETENESS Mailing and Property address Complete
CORPORATE-OWNED Exclude

I got 327 from the above criteria for $57.  I plan to mail to 100 at first.  49 cents a stamp.  Total damage about $107.  $107 isn't that much money.  But, I can think of more fun things to do with $107 than write a bunch of letters and field some calls.

I plan to write everything in red pen and I almost failed penmanship growing up - so my writing ain't too good which might work better or worse.

Envelope:
My Home Return address - I have some return address stickers laying around I plan to use.
Writing their address in red pen.
What color envelope?  Invitation A6?
What stamp should I use?  Spiderman to American flag?

Letter:
I plan on using lined legal paper. 11X14 handwritten in red ink again.  What is the best size paper?

Says:

Dear X,

I would like to $buy$ your house at 123 main street.

Please call me,

Kirk
Google phone number that includes my local area code.  

What kind of voice mail should I have?

I have a preapproval for a VA loan. VA inspections are more geared toward the mechanicals than the bad wallpaper. I targeted a part of town I would like to live in.

Only planning to send 100 letters at least initially.  I am hoping to find someone over 65 that is ready to move down to Florida.

Also, if I don't get a deal out the 100.  What should I do next?  Send out post cards to the same 100 or..??

Thanks in advance for any input,

Kirk