After you pay for the game on the PSN, it's available to download straight away. There's no installation procedure as such, like on a PC.
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They are both the same thing as far as the PSP is concerned. When the game finishes downloading from the PlayStation Network, it is there on memory stick and ready to be played whenever. There is no formal 'install' procedure like for a PC game.
There shouldn't be a specific order, as long as you have the Sims 3 base game downloaded first then the expansion packs and stuff packs should be ok to download in any order.
If you want to install texture packs for Eden world builder you need to have a jailbroken ipod/iphone. If you don't want to jailbreak your ipod/iphone there are ways that you can change the textures but it is difficult and may corrupt your game.
type in psp demos on google or playstation store
First you purchase them from the Playstation Store. Then you download them and if your game category of the cross media bar shows the map DLCs in a bubble when you click on them they install