Hi there and welcome...
One blackmoor or oranda will be fine. Sure, a friend extra would be nice but believe me they'll do just fine on their own.
It won't harm to introduce more platies at once. Most platies are quite hardy. The most obvious difference between an adult female and male is that the anal fin of the male has transformed into a gonopodium.
You can put the pregnant female (if she's almost due) seperate from the others. But you can also leave her in the tank. If there are sufficient hiding places for the fry, sufficient will survive. And not all platies will chase their offspring. Overhere, most of them leave them alone...
So, what happens all the time that every plec of yours seems to dissappear?
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Devoted aquarist ever since early 1970's...
Specialized in livebearers &
specific breeder of rare livebearers...
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