First answer, I have not steam juiced anything, but I think folks on here that do just use the juice.
Second , you can use the bag and put the skins and such in, but the way people talk on here about it you get everything out of it when you steam juice the fruit.
Next, my preference, start the juice out in a bucket. Put a towel over it, I set the lid on top of the towel, helps hold the towel on and keeps critters out. Not such a big problem anymore, the cat has gotten big enough he doesn't have to get into everything. Anyway, for the primary ferment, it makes it easy to check on it and stir it.
Get your specific gravity up to 1.080 to1.090 or so by adding sugar or simple sugar. Check for ph and acid contents if you have the tools. Add pectic enzime, wait 12 hours or so, add k-meta (campden tabs), wait 24 hrs, add half the nutrients, half the energizer, tannins if needed, acid if needed and any other ingredients you mite want or need. Pitch the yeast, either by sprinkling on top, rehydrating then pouring in, or with a yeast starter. (Some warm water, a little sugar, a pinch of nutrient, and add the yeast. When going you can add a bit of your must (juice) let it work on it for a bit and add it all to the bucket. Now wait for ferment to start, depending on temperature, your ingredients, and maybe the phase of the moon it can take from just a little while to a few days to start. Let it ferment down to 1.060 or so, add the rest of the nutrients and energizer. Stir it at least once or twice a day to get some oxygen in it, let it ferment down to 1.010 or so, either rack to a secondary fermenter or snap a lid with an airlock on the bucket. When it ferments dry, less than 1.000, and it stays the same for at least 3 days it is done. Now you can rack it over to a clean carboy, add k-meta let it sit and clear and degass. When you get it clear and degassed, you can stabalize it, sweeten if you like and bottle it. Make sure you sample a bit along the way. Good luck with it, Arne.