Bootstrap HTML form, MySQL query result - php

Question

I'm in the process of migrating a Drupal build out to Bootstrap framework. In the new Bootstrap framework, I've built out a form to pull results from a database.
Bootstrap form HTML:
<form class="form-horizontal" role="form" method="post" action="<?php echo lookup_dosearchx() ?>">
<br>
<div class="form-group">
<label for="county2" class="col-sm-3 control-label">County:</label>
<div class="col-sm-6">
<input type="text" name="county2" id="county2" class="form-control" placeholder="Enter County Name" required />
</div>
</div>
<hr>
<center><i>Include Payroll Notes:</i></center><br>
<div class="form-group">
<label for="employee" class="col-sm-3 control-label">Employee:</label>
<div class="col-sm-6">
<select class="form-control" name="employee" id="employee" placeholder="Enter Employee Name" /><option>Any</option></select>
</div>
</div>
<div class="form-group">
<label for="startdate" class="col-sm-3 control-label">State Date (mm/dd/yyyy):</label>
<div class="col-sm-6">
<input type="date" name="startdate" id="startdate" class="form-control" placeholder="Enter Start Date" />
</div>
</div>
<div class="form-group">
<label for="enddate" class="col-sm-3 control-label">End Date (mm/dd/yyyy):</label>
<div class="col-sm-6">
<input type="date" name="enddate" id="enddate" class="form-control" placeholder="Enter End Date" />
</div>
</div>
<div class="form-group">
<label for="fulltext" class="col-sm-3 control-label">Fulltext Query:</label>
<div class="col-sm-6">
<textarea class="form-control" name="fulltext" id="fulltext" rows="4" /></textarea>
</div>
</div>
<div class="form-group">
<label for="contain" class="col-sm-3 control-label">Phrase:</label>
<div class="col-sm-6">
<textarea class="form-control" name="contain" id="contain" rows="4" /></textarea>
</div>
</div>
<div class="form-group">
<label for="jobid" class="col-sm-3 control-label">VCS Job Code:</label>
<div class="col-sm-6">
<select class="form-control" name="jobid" id="jobid" placeholder="Enter Job Code" /><option>Any</option></select>
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-3 col-sm-6">
<button type="submit" class="btn btn-primary">Submit</button>
<button type="reset" class="btn btn-default">Clear</button>
</div>
</div>
</div>
<br>
</form>
I was provided with a large PHP query set from the prior build out, but that code isn't working when I hit submit. The database is connecting fine as I had trouble getting that to work before.
Would it be possible to be pointed in the direction of a simple example or recommended way to build out the PHP query code I'm calling out?