Hi mfaile1 - welcome to ninja forums
Johnathan has made quite a few changes to the ninja software in the recent past in an effort to make it even better. So, some of the video tutorials may be a bit... antiquated. But you can always learn a lot just by asking your questions here. Another great resource is a new website being launched tomorrow; it a sweepstakes chatroom and also a "sweepstakes university" featuring free access to many video classes on how to become a better "sweeper" and increase your chances of winning. I'll post the link when it's ready (hopefully I'll have it done today).
Regarding finding sweeps, ninja does not do that for you - although ninja's database is constantly updated with new sweeps that it enters for you. But, if you surf around and find a sweep you like, you can add it into ninja and then it will be entered everytime you run ninja after that. Post here again if you need help on doing that. If it's a sweep that is already in ninja you will receive a warning so you won't duplicate it.
Welcome again and Good Luck!