Solved
Starting the drawing
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How should I start this drawing

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How should I start this drawing

I assume you want to create a model of the part.
One approach:
Extrude the "T" shape with sharp corners (in top view)
Add the boss on the top
Add the chamfer
Add the rounds to the external rounds to "T" shape
Shell the model using the bottom face for removal
Add the two holes in the front view
Add the hole in the boss
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