Styling forms is tricky but important. In a large project, you'll want to create some styles that you can reuse on all your forms so you don't have to style them indiviually.
This form markup is similar to what a web framework - say, Django - would generate.
<form action="." method="POST">
<p>
<label>Name</label>
<input type="text">
</p>
<p class="required">
<label>Preferred Taco</label>
<select>
<option>Carne</option>
<option>Al Pastor</option>
<option>Don't care, just add guac</option>
<option>All of Them</option>
</select>
</p>
<p>
<label>Spicy?</label>
<input type="checkbox">
</p>
<p>
<label>Address</label>
<textarea></textarea>
</p>
<p>
<input type="submit" value="Send Tacos!">
</p>
</form>
:before to make the astericks on required fields.label is a good way to make everything line up.