parse the value from a fieldset and echo it in my index

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XML

PHP

Joomla

What im trying to do is, to make a module that parse the values from #__menu_types and pass em in the xml manifest file as fields.
I used this and worked:

<field name="myfield" type="sql" default="10" label="Select an article" query="SELECT title FROM #__menu_types" key_field="title"  required="true">
<option value="">Please select your option</option>
</field>

First of all i cant find how to parse the option and echo it at my index.php.
And second im struggling even more how to instead of a dropdown list make it a cheackbox so i can echo more than 1 values.