Front wheel doesn’t spin freely
You've over-tightened the hub, the most likely explanation. Hub tightening needs a lot of forth and back between too little and too much. And putting the hub into the fork and tightening the axle nuts may also become that little too much. 

Remove the wheel, undo the locking nut and the cone by 1/8 of a turn. Hold the cone with your cone-wrench and relock the locking nut. Put the wheel back in and re-tighten the axle. 

If it turns smoothly it's OK. If it's too loose now, take it out again and tighten the cone by a hair. It's a kind of game, time consuming and nothing to do in a hurry. One of the major reasons why so many 'modern' industrially produced wheels have industrial-type bearings. Correct adjustment of cone and cup systems can be time consuming.