P.S.
I started pumping when Nyah was 4 weeks old. A friend gave me some great advice--pump early in the morning, because that's when you get the most. I'd nurse Nyah early, around 3 or 4 AM, and then pump. She usually nursed mostly on one side, so the other breast would still be really full. Your baby may not be getting up at that time, but you can just try pumping after the first feed. It helps to pump right after you nurse because you've already had a letdown.
At first, you may not get much, but don't be discouraged. I pumped maybe 2 oz. in 15 minutes the first time, but after that could pump 10-12 oz. in 15 minutes. The book that came with the Medela pump says to pump about 12-15 minutes, but you can pump for as long as you want/need to. 15 minutes was all I could take.
I started storing milk before we gave her bottles, so we had a stash. I prefer the bags from First Years. They're sturdy and easy to stand up in the freezer.
When we need milk, I defrost a bag or two. Then you can put it in a bottle. We found the easiest way to heat it was to heat a large mug of water in the microwave, take the mug out of the microwave, and put the bottle in. It takes maybe 5 minutes to heat that way.
I clean pump parts using the same brushes I use for the baby bottles. After sterilizing, I usually just put everything back in the Medela case.
Nyah wouldn't usually take bottles from me. We started out having my husband give them to her when I would go out. He had a really hard time at first, but we kept giving them to her every day until she finally got used to them.
Nyah's 10 months old now, and I still nurse her. She gets maybe 1 bottle per week, and I pump to replace that feeding. She has no problem taking it now, even cold. I can only pump about 5 ounces now though, but I plan to wean her in a couple of months, so that's OK.