Mostly everything will cross over to breastmilk; whatever you eat, your baby will eat. I wouldn't worry about coffee (not sure about red bull and the caffeine content) unless you drink an excessive amount. 1-2 cups of coffee a day is not going to hurt; if you ate/drank it during pregnancy, it will probably not hurt. So, I would eat/drink whatever you want; just be aware of what you eat and pay attention to your baby and how he reacts. If it causes a problem for you, ie gassy foods/spicy foods, it might cause a problem with him. As for alcohol, I've actually heard having a beer/glass of wine every once in a while helps with milk prodution. If you want to go out and have more than that, just pump and dump until you no longer feel the effects of the alcohol. You do have to eat 500 more calories than you did while you were pregnant, too, so now is a good time to eat whatever you want, whenever you want, healthy choices, of course, for the baby's sake (and yours). If you are wondering why you are hungry all the time, this is why, so do not limit yourself. Drink lots of water, too, since he is taking a lot of liquids out of your body (you don't want to get constipated, either).
Yes, continue to take prenatals and omega 3, if you were taking that before, also.
Breatmilk lasts 3-4 hours room temp, 5-7 days in fridge. I think 3 months in the freezer (do not store in door of freezer) and 6 months in a deep freezer.
Try to breatfeed exclusively (no bottles, pacifiers, formula) for four weeks, then you can introduce a bottle, this way he will know how to do both AND your body will know how much milk to produce (it also makes receptors to continue to make milk when he begins to eat solids). When you introduce a bottle, have dad do it, so he knows breast comes from mommy and bottle comes from daddy; have him drink from a bottle once or twice a week, so he can practice, in case you ever want to leave him with a sitter or if you are going back to work. The best time to pump is in the morning, feed him first, of course, then pump and start your collection. Remember, breastfeeding is a supply and demand thing, so the more you do it, the more milk you will make; the less you do it, the less milk. So, if he takes a bottle and skips feeding from you, you will need to pump.
I'm so happy it is working for you both!!! I breastfed both of my kids for a little over a year (now 2 and 4yo) and it is awesome!!!
I know this a lot of info thrown at you at once, sorry. I am a newborn nursery nurse and most of my job is helping moms breasfeed, so this is my passion and love!
Good Luck! and ENJOY every moment!