When it comes to font size, there seems to be a broad spectrum of choices used on resumes. The font size is either too small so as to cram as much information onto a single page (and thereby making the information unreadable by the human eye) or the font is typed at size 16 ( essentially to try to fill the page) when there is just not enough content. This technique we all remember from high school to stretch a two page book report to the required three. It didn’t trick anyone then and it doesn’t work now. Keep the font size between 10 and 12 for the best legibility.
Bold text can be an asset if utilized strategically. By using bold text to highlight your job title and the names of organizations you have been employed it makes your resume easily skimable and that is a good thing. A resume is not just going to get you onto the short list of top candidates but will also be used as a tool during your interview. A lot of times the person conducting the interview will not have had time to review your resume prior to the interview so making it efficient to digest by the use of bold headings will make their job easier and the interview go smoother for both of you.
BE CAREFUL WITH THE CAPS LOCK. It seems like I just shouted this at you, and that is how it will appear on your resume if you constantly put things you think are important in Caps. While Caps can ad emphasis to certain sections, when used too often it will make you look like a maniac. It also makes it look like you aren't paying attention to little details and that can be a turn off for employers as well.