A first step should be to send an email with a few fairly basic questions. Things that are general, and yet fairly important and potentially incommode, like "How long have you been in business?".
The first email allows you to introduce yourself and to see what's their first reaction. Do they want your business or not? Do they answer your questions carefully and in detail or just skimp them? Are they polite? Do they use English the right way (spelling and grammar)?
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