What type were they mostly?
Free Points? Sure
You can just go to the Gen 1 Pokedex and check this for yourself.
That said, the most common type in Generation 1 was Poison, at 33, followed by Water at 32. The next closest was Normal, at 24.
The majority of Pokemon in gen 1 are poison, followed by water, Followed by normal, and our 4th place would be flying.
Here are some graphs for all of the other regions too.