I definitely recommend a nylon string/classical guitar for beginners. The industry standard is the Yamaha C40, and is probably the most affordable decent classical guitar out there. I would definitely avoid the cheap classical guitars from Amazon or Sam's Club, as they are not high quality and usually come strung with the wrong strings. Anything that doesn't have any sort of brand name is likely to be of low quality, making it more difficult for students to play. For some other suggestions for nylon string guitars, see this website.
If you/your student prefer a steel string acoustic guitar, here is a website with some recommendations of some decent steel string guitars. Again, if possible, avoid the cheapest guitars or those without any sort of brand name, as these guitars are usually harder to play.
Here are some links to some options for some decent accessories. These are certainly not the only ones out there, but these are the ones that I use.
Strings
For Guitar Strings, here are a couple that I recommend:
Electronic Tuners
Capos
Books
These are books that we use in class. I do have sets in my classroom, but if you would like to use them at home, here are some links to purchase them.
Here are some options for renting or buying a guitar:
Fort Herriman has a limited number of guitars for rent for $50 per semester.
General Strategies
Slow it down
Play it with a metronome (slow at first, then getting faster as you get more consistent)
Ask for help (either a friend or Mr Davis)
One option is to play it for a friend and get feedback. Then apply the feedback.
Make notes in your music
Circle trouble spots
Practice trouble spots separately
Find and watch a video about the technique you’re working on (THEN APPLY IT!!!)
Play the trouble spot correctly multiple times in a row
Separate skills (do one hand at a time)
Listen to a recording
Working on Notes
Review correct fingerings (look at a fingering chart)
Practice fingerings only (no right hand)
Practice slowly so you play every note 100% correct then slowly speed it up
Isolate the measure that’s tricky, then put it back with the rest
Practice using right hand only
Write in the fingerings or note names (use sparingly, just the ones you need helpful reminders for)
Check your key signature, maybe write in accidentals
Working on Rhythms
Clap, snap, or tap rhythm (count out loud)
Write in the counts
Practice with a metronome
Check your time signature (Is it in ¾?????)
Review note relationships, how long each is held out?
Practice slowly until you get every rhythm correct
Here are some links to some folks who provide private lessons on various instruments: