I concur with both of the above. A 75 watt bulb is standard and quite sufficient. A normal household bulb will work for light tests but will generally, be a big disappointment for actual enlarging use. The condenser must be the correct set for the negative size and enlarging lens. Test with an actual negative in a negative carrier....Oh and the cone has to be the correct length too...it will all make sense if you can focus a negative on the base board. Testing without focussing a negative is kinda hard until you've done it and ahave a feel for these machines.
Don't give up. These are great engalrgers!