I second getting the baby feeding within minutes of the birth. Weighing can come after the latch has been established.
I am breastfeeding now for the fifth time and have had varying success with previous babies. This may be a controversial tip - but I found that taking Motilium transformed my milk supply and wish I'd heard of it before. With DCs 1, 2 and 3 I used to experience the most desperately awful thing of babies sucking, coming off, wailing, rooting, sucking again, then immediately coming off, butting me with their heads and crying. People would say, 'just keep feeding' but mine were too upset and frustrated to suck. When I caved and gave them formula, they immediately wolfed down several ounces like starving babies.
With DC 4 and 5 I have taken Motilium from the off, having read various bits of info about it online. I have had a completely different experience. FINALLY I know what it is like to feed a baby and see it contented. I have occasionally offered a top-up bottle just as an experiment and the baby hasn't even been interested. :)
I buy it online and it costs a fortune but for me it's worth it. For me, fennel tea etc never worked but this does.
Good luck. I will also add that of all my children (some now teenagers) you really can't tell which one was bfed for barely 4 weeks, which for 4 months and which for 7 months. Bfeeding looms as the most important thing in those early days and it's easy to feel suicidal if it isn't working, but at the end of the day, it is only one factor in your child's life. Of course it has many advantages, but I always remind myself that in all the medicals I have ever had, no doctor has ever asked me 'Were you breastfed?'. IMHO it's far more important to make sure your child doesn't smoke or drink or consume too much sugar and stays in good mental health. (Ha. You thought breastfeeding was hard, at least a baby doesn't turn round and say "I don't bloody care about the health benefits, Mum, leave me alone, I'll eat what I like!")