Advice needed on buying a personal boat

I've never owned a boat in my life and now that I live near the sea I would love to own a small boat to travel along the coast from one city to another.

I have no experience with boats so that's why I would love to hear some advice if you have any.

Would you recommend a used one or a new one?

And should I get a sailing boat or a motorboat and what type would you recommend? I don't think I'll have enough means to get a boat with a room inside, unless it's relatively cheap.

And is learning how to navigate a sailing boat a long process?