Ok, i shall continue;
a. With the whole breeding net thing, the aim is too stress the mother out as little as posible; you should try not too move her into the net too soon as you only want her living in it for a max of 2 weeks; any longer and no matter what you do the pregnant fish will start to become stressed which may complicate her pregnancy, so it best to try and keep track on how long the fish has been pregnant for, most livebearers take about a month in total although it can be longer for mollys and swordtails.
Anyways...
b. When the fry are born, much depends on how many there are. Breeding nets also make good secure places to raise fry but i would suggest only having 15fry at the most in a single breeding net, so you may want to invest in another net as platys can have anything between 5 and 40fry on average but for most people fry numbers don't exceed 20.
c. The same net conditions go for the fry although you don't have to take them out every 4days to stretch their fins; depending on how many there are you can usually raise them to about a 3rd grown before releasing them into the main tank depending on what other fish you have.
d. When the fry are born depending on how much nutrition they have in their yolk sacs they may not eat for 2days but to be on the safe side i usually start feeding them after the first day; if you are too feed them any freeze dried foods remember to crush them up very finely as they can choke on them if the peices are too large. There are a wide range of fry foods, it is better to start off with liquid ones like liquifry no.1(for livebearers) and feed them for about a month on it before slowly moving them onto dry fry foods like TetraMinFry and feed them on that for about 3months, gradually moving them onto crushed fish flakes.
I would avoid feeding them anything else until they are at least 2months old like tubifex and daphinia(freeze dried) as they are high in protein and are not that suitable for little fry and are high in protein(which although good, can easily be overdosed upon).
e. Sooner or later you will have to decide what to do with the fry; most lfs's will take them off your hands for free or exchange them for other fish but will not buy them due to insurance reasons.
If you keep the fry, make sure they don't breed with the mother of father fish when they are older as in-breeding fish can lead to many problems.
Overall though, it is best not too move them anywhere/rehome them until they are at least half grown.
f. Other than that, throughout the whole process try to keep water quality as good as posible; it is so vital so that the pregnant mother will produce healthy offspring and also because fry are much more sensitive to these things and living in bad conditions can leave permanent damage on them.
Also, i would try avoid using any medications/salt/ during the fishes pregnancy and when the fry are growing up as this can lead to complications in the fish's pregnancy and kill the fry at worst.
Hope all goes well for you
.My platty is really big and her ventral area is bigger than before and she has a really big gravid spot,i'll probally put her in the breeding trap for only a little while because she becomes really jumpy in there.This is going to be my first batch of fry so I cant wait. 
