Hi rinny and welcome to IIS. I spent the first five or so years observing with a 60mm refractor and 4.5" reflector, and never ran out of things to observe. In the day 8" and 10" telescopes were considered large, and it's only in recent times these sizes have become more common with the advance of Chinese manufacturing.
I hesitate these days to suggest large telescopes for beginners after helping someone out on IIS with a 12" they had bought as their first telescope. After working with them for several months I was surprised one day to see their Dob sold in the classifieds and they left the hobby, because they struggled with such a big scope first up.
The usual (and absolute best) advice is to get along to a star party and astro store and handle some scopes for yourself and that will tell you what size to get. If that's not possible, consider the 8" to start with. If it's something you really get into, you can easily sell the 8" and get something bigger, better and with more features later.
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