There are a few different options for steel-bound strings. You’ll need to determine which gauge string you use and what type of finish you prefer. The standard size for strings is .11 or .12, but you could go higher for lighter strings or lowers for heavier strings. Decide what type of finish from the following types:  Bronze strings have a clear, ringing, and bright tone, but age quicker. Phosphor bronze strings are warmer and darker than bronze strings. The sound is crisp and lasts a long time due to the phosphor finish. Brass strings have a bright, jangly, and metallic texture. Polymer-coated strings have less sustain and brightness, but are warm sounding and resistant to corrosion. Silk and steel strings are popular among folk guitarist and finger picking players due to their softer touch and delicate tone. Lay your guitar on a flat surface, for example on a table, and put yourself in front of your guitar. You could also lay it across your lap or even hold the neck while the body stands upright on the ground. Open the package and uncoil the first string (the thinnest high E string). Look for the string labeled 6th string and uncoil it. Each brand of strings use different legends to help users identify which string is which.

Summary:
Buy a set of strings. Position your guitar. Prepare your new strings.