FIRST AND FOREMOST: if you want to breastfeed, you must surround yourself with people who are supportive and knowledgeable about breastfeeding. there are a lot of people out there who breastfed, or not, and believe and spread flat out myths about how breastfeeding works. these are not people you want on your team! LOL
www.llli.org. la leche league. find a leader nearby you. the closest group to me was an hour away.
la leche league leaders are moms who breastfed their babies for AT LEAST one full year. many breastfeed longer. so you KNOW you are going to get accurate, trustworthy information! you will be able to talk to them about any issue, and they will either have first hand advice, 2nd hand advice from another mom who is/was in the group, or at the very least, information, books, pamphlets and other tools to help you out!
www.askdrsears.com is also a great resource.
but above all, just nurse nurse nurse! dont think for a minute that you cant or shouldnt nurse your baby when you know that baby needs it! :) even if you dont think that baby is getting anything, your body is constantly making milk, so theres no doubt that your baby can constantly get a little, even if you cant pump or manually express any out yourself.
dont limit your baby to certain time periods on each side. just let your baby nurse until baby seems ready to switch sides (some babies will get frustrated when the milk letdown slows) or even until the next feeding! :)
above all, you CAN do this. i nursed my son until he self weaned at 20 months. i couldnt believe he self weaned! it was amazing to know that i completely fulfilled his need, and that i could allow him to grow out of it on his own. it was awesome. theres nothing like it in the world.
so, just get support. go to a meeting NOW - THIS MONTH if possible. pregnant moms are welcome!!! this way you can be used to it before baby comes, and even find people who can (and likely will) help you after baby is born!
one thing you can do is to nurse on one side while pumping on the other. that might help.
as far as making milk come in sooner, dont neglect the importance of colustrum - the milk that you have while baby is born! its drastically important! so just nurse nurse nurse!