Re: how to build up a stock ?
queries all the time is what we're here for!
1) partly your preference. we prefer to freeze all food in bottles (DH is a little crazy on the plastic-is-bad-for-you, especially for freezing and heating). but freezing 4 oz in a glass bottle takes up a LOT of room, and we found it didn't keep longer than about 6 weeks - the air at the top of the bottle allowed freezerburn. bags are more efficient and easier. i liked the lansinoh bags, i've also heard great things about the honeysuckle bags. i think it's worth the extra cost to get a good bag. you wouldn't believe how big a difference it makes.
4) yes, but once you thaw freezer milk it should be used within 24 hours. i froze in 4 oz bags; some people freeze in 2 oz bags just so they only have to thaw what they need. you can experiment with what works for you.
Nursing, pumping, cloth-diapering, babywearing, working professor mama with the awesomest SAHD ever.