You can import a .GED file to wikitree. Here's the page about gedcoms. You should probably read before importing and after importing.
Also, if you ask anyone here they will tell you, start with a small gedcom 10-50 people, then go through them all and neaten them. You may discover it would have been easier to enter them one at a time.
The help index can be found under the drop down "Help" menu in the upper right corner of this and most pages.