First, I would never dream of not just focusing on one city. There is just too much time lost in the travel from city to city process.

Second, I have lost as many as 4 ladies right in the last week before a trip, so your 6 can possibly boil down to a WMVO trip or a likely WM visit zero trip.  These women have things happen in their lives like job transfers to another city, job changes wherein the can't take the days off they had planned, parents sick in other cities, etc.

In my case, I was usually writing to 20 or more, so losing 4 wasn't a catastrophe, but for smaller numbers of contacts, it can be.

There is a very easy way to keep track of a large number of ladies that you are writing to at the same time.  Set up a listing somewhere on your computer, or even via hand on some paper.  List each womans name and important data down the left hand side:  then have columns to check off when you send each lady a certain bit of info about yourself, etc.

You can have standard letters you send, each containing some important info about you, your family, your job, your state, city, etc, etc.  Then, for each lady, you customize each standard letter somewhat to answer the questions she posed in her last letter, to ask questions specific to her situation, etc.  You can mix the customized sentences thoughout the standard letter and, in that fashion, it will lessen the tendency for the letter to look like a 'boiler plate.'

This is really not that hard.  Anyone who has done any sort of administrative work, kept a household budget, kept track of which kid has to be a which activity on which date, etc., should be able to keep track of 50 or so ladies with little problem.  It is however, time consuming . . . make no mistake about that.

And then, you also have to avoid the tendency to fall in love with any of the women via the e-mail contact.  This is what many guys do, and hence they then state that they simply cannot carry on correspondence with more than one at a time.  But the more you write to, probably the less tendency there is to fall in love with one of them.  The more you have going at once, the less likely that you will fall in love with one's letters.

Wait to fall in love until after you have met with all of them once, and have met more times with a few of them, and have met some more times with only one of them.

JR

2. personal email,or mail forwarding through a reliable agency. if she has a home phone and speaks good English, I would prefer to call than write.

3. location is not an issue if you've got the cash. You can fly her in to Moscow or Kiev for example. if not, stick to girls from the city that you are planning to visit soon.  

4. keeping track - keep separate files according to name,the last thing you want to do is to confuse names and address.

5. use a rating system based on compatibility. put No.1 on your favorite girl's file. Also have a No. 2 and 3 and 4 if things do not go to plan.

lots more I can't think of right now.

my first choice of screening is always knowledge of English and ability to express herself. I think a successful relationship is based first and foremost upon communication.
even if her English is not good you can judge by what she writes and how much about herself she discloses. I prefer women who am, er, - bared her soul and opens her heart- than to someone who limits to just answering questions.

MY personal preferences. FWIW