What kind of guitar should I buy?

Your best bet is to go to a music store and see what they have in your price range. If it is your first guitar don’t buy something too expensive until later when you are sure that guitar is a long term thing in your life.

Do I need to have different guitars to play different styles of music?

Yes and no. First of all, you can start learning virtually any style of music on any style of guitar. However, to get a true idiomatic sound in a particular style you do need to have different guitars. For example Classical Guitar is played on a nylon string guitar (and with right hand fingernails). Jazz Guitar sounds best on a hollow body guitar. Blues, Rock and Country Guitar are usually done on solid body guitars. After a student acquires basic proficiency in multiple areas and proves to be serious, then it is time to consider a specific style of guitar that is appropriate for the style they wish to focus on.

How do I change my strings?

Changing strings is a relatively simple process that can differ slightly depending on how your guitar was made. The process is always similar no matter what kind of guitar you have. I can easily teach this during a lesson.