So going back to classics, good idea, I approve but there is some things you forgot to take in mind when doing this.
Doctor Who started in the late sixties and worked all through the seventies and eighties. This is important to keep in mind when considering the target audience was a vastly different group of people than the new doctor who. Its original audience was adults in the 30s+ who enjoyed smart scifi and history.
Secondly, the first doctor established the premis of the show via magical blue box, the second introduced regenerations and some aspects of his race, but there was a lot of character development that lead up to that through doctors three and four (longest running doctor was tom baker as the fourth) one of which the major scenes was this this interaction at the end of the mission The Doctor was assigned to go back in time and erase the Daleks from existence.
WikiQuote
The Doctor: If someone who knew the future, pointed out a child to you and told you that that child would grow up totally evil, to be a ruthless dictator who would destroy millions of lives... could you then kill that child?
Sarah: We're talking about the Daleks; the most evil creatures ever invented! You must destroy them! You must complete your mission for the Time Lords!
The Doctor: Do I have the right? Simply touch one wire against the other, and that's it. The Daleks cease to exist. Hundreds of millions of people, thousands of generations can live without fear, in peace... and never even know the word "Dalek".
Sarah: Then why wait? If it was a disease or some sort of bacteria you were destroying, you wouldn't hesitate!
The Doctor: But if I kill... wipe out a whole intelligent life-form... then I become like them. I'd be no better than the Daleks.
The end result was no, the doctor couldn't go through with it, in spite of knowing what would happen. It is less surprising to know he wouldn't take down The Master.
If you want to start with the classic series I recommend going a little farther back than the fifth if you can. I found a torrent a while ago that had the first 19 (of 21) seasons, including the reconstructed episodes, but I don't remember where. Personally I like that it started with a grumpy old doctor, then moved into the aloof doctors before becoming light hearted and fun doctors. That realization that you will live forever if your careful so have fun with it was a big part of who the Doctor is. And it is back-story like this that makes the 10th doctor's line "I'm so old now, I used to have so much mercy." was so haunting in new series.
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