As a soundman I make certain to use EQ in a very purposeful way to get every instrument to sit well in the mix. This is not an easy task for the inexperienced because you always have to keep in mind how to EQ an instrument as a solo channel while knowing what that will sound like when the other instruments are added. If your board is limited with regard to EQ'ing the low end of each channel, it may be useful to have an dedicated EQ for each instrument. Having the on-amp ability to parametric EQ the bass is especially useful. Also take advantage of the low frequency cut switch on most boards.
The best way to get a great kick drum sound is to decide ahead of time how it will blend in with the bass. Both the bass and kick want to occupy the same low frequencies and there needs to be some give and take between them to keep them from fighting one another. In general, the genre of music will determine how to finesse the low end of each channel. Punk will sound different from jazz which will sound different from country or heavy metal.
As an example, I like to EQ classic rock with the kick drum occupying the lowest frequency with the bass taking up more space just above it. To accomplish this, boost the kick @ 40 Hz and cut it @ 100 Hz. Do the opposite with the bass. Also make sure none of the other instruments are putting out any real volume below 100 Hz. This is especially important for the rhythm instruments such as guitar or keys. The other part of this process is to make sure the kick and bass aren't interfering with the other instruments so you will have to do some creative cutting to the mids in particular. Give and take is what makes this all work.
As has already been said, this assumes you have a good sounding and well tuned drum to start with and a decent microphone. Likewise, experimenting with the placement of the microphone is very important since this will greatly affect the sound coming in to the board.
Finally, a compressor used on both the kick and bass will keep their levels balanced with respect to each other and this also has a profound impact on the quality of the sound. I always use a dual channel comp in the inserts of my kick and bass channels. I consider them crucial.