Whould a cr85 be good size dirt bike for me?

You are too tall for the cr85. This is also a 2 stroke and not ideal for someone with no experience

Are you going to race as if yes then you need to look at something more like the crf250r. If not racing then look at bikes like these TTR250, WR250, XR250. They are basic trail bikes and would suit someone just starting out.
 
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