I am happy to give instruction on both acoustic and electric guitars. The choice is up to the student. If you're just starting out and aren't sure what guitar is best for you I'll be happy to advise you.
Picking out a guitar is not a 'one size fits all' deal. There are many websites devoted to the topic. You may buy new or save money and buy used. If you buy a used guitar to start on I would highly recommend you have an experienced player look the guitar over to make sure it doesn't have any major flaws. New guitars may also have defects so don't assume they're in perfect shape off the showroom floor. Acoustic guitars are particularly susceptible to humidity and temperature variations which can dry out the guitar causing warping or the bridge to come unglued etc. If you're not sure about a guitars condition make sure to have a good player or repair man check it out. For a list of recommended area shops check out my Resources and Suggested Text page.
The Basics. (What you need to start)
1. A guitar! (acoustic or electric) In good playable condition.
2. Guitar picks (I recommend Medium thickness for beginners. Try to find a pick that has a grip/texture. Picks can be quite slippery. The last thing you want to have happen when playing is for the pick to slip out of your fingers like a soap bar in a shower!
Check this link for more info. http://learningguitarnow.com/blog/beginner-guitar-lessons-2/what-kind-of-pick-should-i-use-when-learning-guitar/
3. Electric guitar tuner. Many tuners are available. I recommend getting one that clip on to the headstock such as the "Snark" tuner or a similar one. http://www.amazon.com/Snark-Instrument-Clip-On-Chromatic-Tuner/dp/B003VWKPHC/ref=sr_1_2?s=musical-instruments&ie=UTF8&qid=1345753892&sr=1-2
4. A notebook for organizing lesson materials. I'll give you a lot of papers and lesson materials. I'd recommend coming with a three ring binder with page protectors.
Etc. (Optional but recommended)
1. Text book or books. I'll advise you on this as we progress. Click here for an overview of some of the books I use with students.
2. An Amplifier and guitar cable if you're going to play electric guitar.
3. An extra set of guitar strings. If you have a used guitar I recommend putting on a fresh set. I suggest light gauge strings for ease of playability. If you want to spend a little more for acoustic guitar strings that hold their 'new' sound for a longer period of time I'd recommend "Elixer Poly-web" guitar strings. These are available at most of the local Duluth shops. http://www.musiciansfriend.com/accessories/elixir-polyweb-acoustic-light-strings
4. Guitar polish and polishing cloth. Keep your guitar in clean, playable shape.
5. Guitar case and guitar strap.
Here are some helpful sites when deciding which guitar is best for you. There are many more. Do some of your own research.