I second the recs to go to kellymom.com and workandpump.com for LOTS of basic information, and also to help if you need any troubleshooting.
If you are working full time, I'd invest in an electric pump. I understand that your money is probably tight if your husband is out of work, but you'll likely be frustrated trying to use a manual pump for more than the occasional session. Medela and Ameda are two of the most popular brands. You'll find mixed recommendations on buying used, but I wouldn't have a problem with it except not having a warranty on the machine itself. (You can sterilize or replace parts that came into contact with someone else's milk.)
The system I'm using is to transfer my milk "stash" to plastic breastmilk storage bags. This is the milk that I don't use on a day-to-day basis but is for emergencies or unusual happenings (I spill a bottle, my supply drops, baby is having a growth spurt and wants more than expected, etc). It is frozen flat and goes in the deep freezer, where it will keep for up to one year. This is milk that I pump while on maternity leave, or because I'm engorged first thing in the morning and want to relieve the pressure, not milk that I'm pumping at work when I'd normally be feeding my baby.
During a workday, I'd pump on roughly the same schedule that my baby eats when I'm at home. My pump came with six bottles and I bought a 4-pack of bottles in addition. These are all 4 oz bottles. What I pump that day goes home and into the fridge for usage the next day (will last in the fridge up to 8 days).
To figure out how many bottles, add up how many feedings you expect your baby to have while you are away. Multiply that by 3 - one set to bring to work to fill with the pump, one set to have in the fridge at home for your husband to be feeding your baby, and an extra set in case you don't get around to washing or are filling up more than you expect.
To figure out how much milk you need, know that the average baby between the ages of 1 month and 6 months drinks about 25 oz of breastmilk per day. It doesn't really change between those ages, though they drink larger meals less frequently as they get older. Before you return to work, pay attention to how many feedings your baby takes in a 24-hour period. Divide 25oz by the number of feedings, and that's the approximate number of ounces per feeding. As you can see by this formula, it's likely 4 oz bottles are all you will need with breastmilk - your babe would have to get down to six feedings in 24 hours to be likely to want more than 4 oz at a time. Those big bottles are more for formula-feeding.
In other words, if my babe eats 8 times in a day, the 25oz divided by 8 feedings means she is eating around 3 ounces per feeding. I would feed her just before going to work, she may take a morning bottle, I feed her when home for lunch, she may take an afternoon bottle, then I'll be home. If she's eating 3 oz per feeding, and I expect to be away from her for two feedings per day, then I need to leave at least 6 oz of pumped milk at home for her.
While many breastfed babies will take bottle without a problem, you may want to have your husband start offering one bottle per day at around four weeks of age to make sure you aren't going to have problems and to get her used to the different type of nipple. Use the slow-flow newborn nipples.
