Welcome Pinky and congrats! Not long to go anymore although I found the last 4 weeks the hardest to deal with, possibly because I carried till 40 weeks 3 days.
Oh April babies, I think next time I want an April baby too
Well seen as it's going to be rather cool by then, long sleeves will do the trick with almost all your clothes. Buy one or two outfits which are a bit cooler (not shorts and a t-shirt

just a cooler material) and 2 or more short sleeved vests. For the rest you don't really need more than 6 - 8 outfits and vests. Two piece clothes don't work very well because the shirts keep riding up and its just irritating. Although cute outfits are just that, cute, some of them are a waste of money. Don't spend too much money on newborn clothes, this is also something people love to give at baby showers so wait till your baby shower is over and done with before you make a list of what you still need.
If your baby doesn't have reflux then you can get away with the same clothes a couple of days in a row. But if you have a messy baby you will find yourself washing baby clothes once a week, so 6 - 8 of everything will be more than enough.
Above all just remember, the stores don't close the minute your baby is born! You can always send your husband if you see something you forgot.