It depends on what you are trying to achieve. Do you want to make your project look like a silent movie as it appeared in the 1920s, or how that same film would appear today. Silent movies back in the 1920s looked just like any black and white movie shot today. The "look" we associate with silent movies -- fast motion, grainy picture, high contrast, etc. -- is due to the aging of the film, endless copying of copies, and being shown at the wrong speed. If you ever see a silent film that has been properly preserved or restored, especially one from the late 20s, you'll be amazed at how "modern" they look.
As for title cards, there was no set standard across the industry. Usually, they had a border that might have a studio logo or the name written at the top or bottom. Some would even have small illustrations in the corner, but that was rare. Likewise, there was no typical font. As was suggested previously, you should watch a number of silents online. TCM also shows a different silent movie every Sunday night at Midnight.
Music varied as well, depending on venue. Films shown in small towns would only have a piano, where films shown in big cities could have a full orchestra. While some films in the late 20s would have a score written for the film, generally the accompanist would work from a set collection of familiar songs/music to set the mood for a scene. For example, if a character on screen was drunk, they'd start playing "How Dry I Am." (This practice was carried over into the Warner Bros. cartoons to supplement original music by Carl Stalling). Accompanists had to play the full length of the film (no quiet spots like modern movies), so they had to have a full library of music at the ready. While some large-budet films in the late 20s did get original scores (distributed as sheet music), it wasn't really until the Sound era that silent films really got dedicated scores. Chaplin continued to make silent movies well into the sound era -- his one concession was music and sound effects because he liked the additional control. He wrote scores for his films by "la-la-ing" for a transcriber and went back and scored his earlier features. You can even buy some of Chaplin's music on CD. For the expert on silent film scores, look up info on Carl Davis. He has scored many silent films. If you live in the LA area, you can also visit the Silent Movie Theater.