Depending on where you are releasing your paper the appropriate font size is different. A journal will have its own formatting standards, quite likely its own documentclass, and you should follow that. Mathematicians who "publish" papers to the arXiv tend to just use the defaults, so a lot of papers there are 10pt. Many people (such as those with poor eyesight, and also me) express a preference for 12pt, which is done via \documentclass[12pt]{article}
(or whatever class you use); if you do that, you can also use the geometry
package to change the margins to one inch: \usepackage{geometry}\geometry{margin=1in}
, as the default large margins start to look silly with fuller text.
The hyphens are inserted automatically by TeX because you are using too many long words. Sometimes the microtype
package can help with that, but sometimes, there's no other way to fit everything nicely onto the line.
\documentclass[11pt]{article}
. Also, load thebabel
package with the option for your language (for example,\usepackage[english]{babel}
)