Try to keep it to one page, however, if necessary, a page and a half is okay. Not too much detail - something they can scan for highlights while still talking to you!
Sorry, I cannot address the skype situation, hope someone else joins in on that question!
best of luck!
For a Skype or other online meeting, I would email whomever you are put in contact with to introduce yourself before the interview and you can take that opportunity to attach any documents to that email as well.
Hope this helps, and good luck!
For online interviews, ask for email address and ask them if they would like a copy. Generally when you apply you submit a digital version of your resume that the interviewer will have but it is always nice to ask.