I've tried many different varieties of picks over the years. Here a couple of my favorite types. Fender's Premium Celluloid picks are what I most often use. I've tried other brands, and they just don't cut. The Premium Celluloids are smooth even with time- plus they don't come out of those "powdery" boxes or feel like they grate the strings as you're playing. I personally like the Mediums for all around strumming and picking. To order a 12 pack click the first icon to the right, or here.
For more intricate picking I find its helpful to use the Fender 358 Jazz Pick Shells. Because they're smaller and rounder in appearance they will help you get around the fret board quicker. Click the icon on the side to order, or click here.
If you are a serious guitarist, sooner or later you'll want to change keys by using a capo. Take it from me- I've purchased probably 20 capos so far- you want a spring action one. It may be a little more money, but it's well worth it. My friend got in trouble once at a performance because he was using a string capo and it came off in the middle of a song.The "K-Style" capos seem to emit the most pressure on the strings. Go with something like the Kyser Black Capo. Click the icon to the right or here to order.
I'll be honest. I've never thought strings make a huge difference in sound, at least for acoustic guitars. I've used many different kinds, but my default is the D'Addario Phosphor Bronze Medium. They're cheap, they last, they sound good. Click the icon to the right or here to order.
There are many types of guitar tuners out there, and I've had the privilege of using a lot of them. Some have metronomes and digital pitch pipes. Some frankly don't pick up the sound of your strings well at all. In all the years I've been using different brands one of my favorites is the Korg Chromatic Tuner. It seems to pick up the notes well which is all I want in a tune. It's also fairly cost efficient. To get yours, click the icon on the right, or here.