Please read the stickies in Pool Chemistry for Intex-type Pools (you may need to log out to follow link). They'll get you a good start.
That's a pretty big pool. The included filter pump may be adequate if you have relatively low bather load, your swimmers are clean, and you never get behind in the chemistry. Take a look at Cleaning your Cartridge Filter without Damaging It! and buy at least a couple of the high quality filters referenced there and the necessary cleaning supplies.
A Salt Water Chlorine Generator can be a convenient source for chlorine but will not alleviate the need for daily maintenance including measuring / adjusting chemistry. One note, many of the intex SWCGs come with a copper ionizer feature. I'd try to find one without this feature or disable it if posssible. Copper can stain pools, fingernails, light and colored hair green and can also encourage poor sanitary conditions in a pool. I can't emphasize enough how much easier pool care is with a Taylor K-2006 - it's the best money I've ever spent on my pool.
A caution: Pools must be built on level, undisturbed soil. That's measured level, not looks level. Building up usually does not work as the weight of the pool will compact the soil beneath it. If there's a high area in the pool site, it must be dug down. Ben posted this recently about using a water level: A roto-tiller can be reallly useful when digging.
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