I'm just going to touch on babywearing, since I run the local BW group in my area.
For a newborn, a wrap (either stretchy or woven) or a ring sling is your best option. They give ideal positioning, which no SSC (like an Ergo) can do (even with the insert). Plus, the newborn insert for the Ergo is very warm. A stretchy wrap (Moby, Boba wrap, etc) is great for a newborn, but most people find it less supportive after 15 or 18lb. It can ONLY be used for front carries, never back carries. These are easily found used for around $20-25 used, so if you want one I highly recommend buying used. Woven wraps are not stretchy and can be used from newborn through toddlerhood. They are sized (from a size 2 - size 7 - the size is based on the length) - if you are tiny a size 5 is a standard "starter" size, if you are average sized a size 6 or if you are plus sized a size 7 is a good base size. That allows a ton of carrying options (front, back and hip carries can be done with a woven wrap). Woven wraps are probably the most versatile carrier, but take a bit longer to learn than something like an SSC. A few common brands are Didymos, Girasol, BBSlen, and Storchenweige (there are tons more though). They cost more than a stretchy wrap, but hold their value really well.
Ring slings (not pouch slings) are great for newborns and can be used right through toddlerhood (although, since they put all the weight on one shoulder, a bigger kids can get heavy quickly in one - they are great for up and down with a toddler though). They are a bit easier for most people to learn than a wrap. My favourite ring slings have a pleated shoulder (SewFunky or Sleeping Baby Productions are my favourites), but a lot of people also like a gathered shoulder (Sakura Bloom are gorgeous slings).
If you have any babywearing questions, there are lots of BW groups around. Another good resource is
www.thebabywearer.com - they have FSOT forums and tons of info.
Good luck and congratulations. I have 4 kids - it's lots of work, but lots of fun too.