Music Stand
Don’t buy the cheap wire folding ones. They just don’t work very well. For a little more money you can get a sturdy, solid metal stand. It will do the job well and last forever.
Metronome
The two features I look for are a dial selector and a good sound. Stay away from the digital ones with myriad buttons and annoying beeps. This one is good and inexpensive.
Tuner
Tuning is difficult, and cheap tuners don’t make it any easier. This one is inexpensive and has good reviews.
Picks
Too many to choose from! You can browse for fun colors and designs, but at the end of the day a basic medium thickness pick is the right choice for almost everyone.