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Jump in with both feet, and eyes wide open. Make mistakes but learn from them. Are you new to drafting and design? Are you new to AutoCAD period?
If so, learn the shortcut keys, at least for commands. Beginners use point-and-click button commands, but as you gain experience you tend to move toward typing shorthand commands in conjunction with mouse-clicking. The spacebar works like the <enter> key. C means circle, L means line, etc. PL means polyline, PE means edit polyline.
CAD programs treat the model you draw in modelspace, as if it was being created in a 1:1 scale ratio. Paperspace is for printing (plotting) the output, and is also in a 1:1 scale. Views of your model are arranged in paperspace, which is like the sheet of paper that draftspersons used to draw on, on a drawing board. The views are like monitors looking at a stage, and your model is the object on the stage. You scale the views as if you were zooming the cameras in and out. This is instead of trying to draw the model to a fraction of it's true size (the old fashioned way we used to draw on the board).
It is important these days to have some idea ahead of time what scale and what unit of measurement you will use the most on a particular model. AutoCAD should be set up to draw either imperial or metric, and even in modelspace there is a place to set what scale you want to insert annotative objects into the drawing at.
DDE = direct distance entry. You start a line for example, move your cursor in the direction you want the line to go, then type in the distance and hit enter.
F8 toggles your ortho on and off; F9 the snap spacing; F10 the polar settings (I keep mine at multiples of 15 degrees); F7 your grid (drawing aid); F3 your object snap; F2 your text window; and F1 the help screen.
Ortho is the AutoCAD equivalent of a set square and t square. Polar is like having an adjustable set square. The delete key is like the erase button (if the noun-verb settings are set for that).
That should be enough to get you started. Good luck! 
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