From other people.
Depends on the make of the guitar and amp. What are they?
Well, whatever they are, you're doing the right thing by buying something cheap to begin with. Some overenthusiastic people buy something expensive without realising that they might give up practising in a month or two. Just realise that you get what you pay for -- at $200 you're going to get a pretty cheapo sound, especially on an electric.
If you plan on buying an acoustic, I can recommend anything in the Yamaha FG line, and if you're lucky, you might even find a Seagull S6 for under $200.
If you plan on buying an electric, I'd recommend a Yamaha Pacifica 112, or an Ibanez RG321. Do not, for the love of god, purchase anything with a Floyd Rose-style bridge ('whammy bars'), because on a budget of $200 you'll be going out of tune ALL the time. Also remember that your tone quality is primarily from the AMP not the guitar itself, contrary to common opinion. Don't buy a Gibson Les Paul and a $50 Marshall amp and think you'll sound like Slash... it's just not happening.
Unfortunately on a budget of $200, you're not exactly spoilt for choice. Something like the Line 6 Spider line of amps should give you plenty of effects to keep you interested though.
It doesn't really matter whether you buy an electric or an acoustic -- they're essentially the same instrument, and techniques are identical (with a few small exceptions). It matters slightly more if you plan on focussing on classical music, since the fretboard is considerable wider. The sort of music you'll usually be playing should determine your choice. If you tell us what that is, I could provide alternate suggestions that might be better tailored to your needs.
Also
buy a metronome (or drum machine or something equivalent). I can't stress this enough. I've seen literally hundreds of people whose playing is stunted because they didn't focus on developing a decent sense of rhythm in the beginning.
It's important that you state what sort of music you'll primary be playing (and be as specific as possible), because I could provide suggestions more tailored to your needs.
General advice: do not buy online, except *perhaps* if you're buying something cheap from a reputable dealer. For every bargain on Ebay, there's a ripoff. Every guitar is an individual, even when manufactured by a well-known company.
Try to buy in person, and don't be afraid to haggle. Make sure *you're* comfortable about how it feels -- whether the neck is suited to the size of your hands, how heavy it is, etc. If at all possible, get someone who can play guitar to go along with you to test it out while looking for intonation problems. This specifically means checking to see if the guitar is in tune at higher frets as well as lower ones -- it's a particularly common problem on low-end guitars caused by tiny bends in the neck or issues with the guitar's saddle/bridge, etc.
There's no harm in taking lessons obviously, but they can be expensive, and plenty of people who are unqualified to teach try to pass themselves off as teachers. Remember that the guitar is an extremely popular instrument -- there's bound to someone near where you live who can help you out. If not, there are plenty of websites offering free lessons. I'd start with these, because the lessons provided can be just as good as anything you'd pay for.
Also, while there are lots of books out there to teach you the basics, these days DVDs/videos are more popular, for obvious reasons.
Here's some resources:
http://www.justinguitar.com/ -- also has an extremely popular Youtube video lesson profile too.
http://www.guitarmasterclass.net/
If you're absolutely insistent about buying a book, I've heard these are good:
http://www.amazon.com/Modern-Method-Guitar-Volumes-Complete/dp/0634012339
http://www.amazon.com/Hal-Leonard-G...bs_sr_1?ie=UTF8&s=books&qid=1195787261&sr=1-1
Should you ever get past all that:
http://www.ibreathemusic.com/ - intermediate/advanced lessons
P.S. Don't start on scales. Start on 'open chords' and learn a song or two. Do a google search or check out one of the first two websites I suggested.