I uploaded a 2D logo with the idea of turning it 3D. I drew around the parts I wanted to extrude and can now use the push/pull feature to raise them up. How can I make sure I raise each section to the same height?
One way is to type the extrusion distance after you start the extrusion.
Assuming the faces all have the same orientation, after you’ve extruded the first to the correct height, you should be able to double click on the other faces that need extruding and get the same height from them.
Clearly you don’t have the face orientation the same on all faces. It looks like you’ve done something else since the extrusion heights aren’t the same.
To find it, try Save As instead of Save, and see where Sketchup has put it.
Then upload that file (seventh icon from left above where you type your post), if it is less than 3MB. If it is bigger, upload it to a file sharing site - the 3Dwarehouse, Dropbox, OneDrive, Google Drive etc - and post a link to it here.