250 ninja is well known as a great beginners bike! I've never been impressed by Hondas or Yamahas but Suzuki's are also great Bikes if ya really want an alternative! Personally I would probably look for an old classic Suzuki, Kawasaki or Yamaha 2 stroke 250 in decent shape and fix it up...
there is no set answer to your question my 74 suzuki gt750 went well over 100k without any real problems, yet I have seem other bikes that were shot out after around 20k! It all depends on how hard ya ride it, how well ya maintain it and how well your particular model was designed in the first...
first off you will need to download them from Youtube, Moyea makes a free down-loader you can use for that then once they are on your hard drive you should be able to burn them but you may need to change the file format to be able to play them on a household DVD player Nero Burning Rom...