So I want to buy some stuff

I have the latest MBP 15 inch laptop. Which I guess has a default amount of 2 gb of ram.
How many memory slots does this computer have?
I am guessing it only has 2 slots and they are filled 1 gb sticks.
If I want to max out my memory to 4 gb do I need to buy 2 2gb sticks and toss both sticks in the laptop now?
I would also like to buy an additional power supply. At best buy I noticed they come in different wattage amounts.
How do I know which level of wattage to buy.

"How many memory slots does this computer have?"
Two.
"I am guessing it only has 2 slots and they are filled 1 gb sticks."
There you go.
"If I want to max out my memory to 4 gb do I need to buy 2 2gb sticks and toss both sticks in the laptop now?"
Yes, now, or any time in the future.
"I would also like to buy an additional power supply. At best buy I noticed they come in different wattage amounts. How do I know which level of wattage to buy."
Check the output of your current power adapter - it's printed in dark gray (or it it "grey") ink on the side of the power adapter. My guess is that it's 85 watts, or something like that.

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