The Validation Toolbar (F7) may help you to fix the contours that are the wrong direction. Clockwise contours inside other clockwise contours will be black. To make them white, reverse the contour direction.
The size is not really an issue, and it’s easy to resize vectors using the corner handles, or the Scale tab of the Transform Toolbar (F6).
Imported glyphs are positioned with the bottom left corner of the contour at 0,0, which will rarely be the correct baseline of the glyph. Just move it after scaling it.
See this tutorial thread on Importing Vectors
