1st try?!!!

....Well..don't think mine will look anything like that.

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Decisions, decisions.
Is there some kind of mathmatical equations to size.?
ie: dpi = pixels., dpi= inchs that kind of thing, if I'm explaining myself so you understand what I'm getting at. Or am I thinking to hard..LOL.
More detail means, more accuracy, means BIGGER...I like detail.

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BUT..means, more time, more work, harder. Don't want to bite off more than I can chew.

Everything has to be to scale, detail etc. Why is there no smiley pulling hair out..LOL.
Again , thanks for the help guys..much appreciated.
I guess I'll just have to dive in.
Here goes..( hold breath, pinches nose)... SPLOOOSSH!!!
I forgot ...I can't swim...AAAHHHHHH!!..Blub!..Blub!