Expressed Breastmilk storage

[Wenglish]

Please be gentle but I have no idea how to store Breastmilk!
I'm about to start expressing but I have no idea what I'm doing!
I pour expressed milk into a specialist Breastmilk storage bag.
I sterilse the bottle I expressed into.

Storing the milk, do I have to wait before I put it in the fridge?
How long in the fridge?
How long in the freezer?
How do I defrost it and warm it?
(I know not to shake but swirl the milk).

I'm not completely stupid I promise!
Just rather sleep deprived and keep reading conflicting advice!
I just want to make sure I'm doing it safely.

Is there a 'how to book'?

Put it straight into the fridge in a sealed bag or lidded container. Shelf not door. In most fridges it lasts 5 days!

It lasts 6 months in the freezer. I just put it straight in. Defrost in the fridge or run the container under warm water.
Before freezing a huge stash, defrost some and check it tastes/smells ok. Some people need to heat their milk to steaming in a pan before freezing it or it becomes funny tasting. Most don't.

Oh and never heat breast milk in the microwave! It is dangerous in terms of heat pockets and destroys some of the nutritional elements. Put the bottle in a bowl of hot water from the kettle for 2-5 min depending on how warm the baby likes it, and check in your wrist.

...obviously straight in the freezer in a bag or tub! I also use lidded ice cube trays as 1 cube = 1 oz. DD used to have 2 oz feeds, now 3 oz ... I would pop out what I needed.

I would also try to give the baby milk straight from the fridge if they accept it its less work for you. We've never warmed ours and he guzzles it down regardless.

Thank you for your helpful replies.
At least now I know what I'm doing!