Use headings and subheadings to help your readers find the information they're interested in. Avoid using more than two type families on a page. Generally one serif and one sans serif make a nice mix. Using the sans serif for headlines and the serif for body text is a common and familiar formula. Use italics and bold to highlight words and phrases, rather than using all uppercase.
All uppercase is hard to read.
Left justification can be easier to read and looks less formal than full justification. Pick the one that matches the tone of your document. Graphs, pictures, and charts add interest to your documents and clarify your text. Horizontal and vertical lines can be used sparingly to break up blocks of text. All rights reserved.