I've made a number of YouTube videos with a 5D2. I guess the 5D is not dissimilar? As Steve says, don't film long takes. Shooting in HD the 5D2 has a maximum of 12 mins per take before it stops filming. Also if I do a sustained period of filming without breaks between takes the camera overheats and shuts down. As long as you take heed of this it's a great camera for filming. I use Cyberlink PowerDirector for editing. I've always found it more user-friendly and better suited to the work I do than Adobe Premiere.
Get yourself a good external microphone and recorder. You don't have to pay a fortune for one that's perfectly adequate for vlogging and it's vastly better than the onboard mic in the camera. I've got more sound gear than I need because I made a feature film, but for vlogging something like my Tascam DR40 recorder would be ideal. It has built-in stereo mics but you can also plug in a cheap lapel mic for really good voice recording.
Alan