Set Craft variables in the markup
Just use a variable that has the same keys as the entry model will have.

{% set entries = [{title: 'hello', ...}, {title: 'hello2', ...}] %}

{% for entry in entries %}
    {# stuff #}
{% endfor %}


Then, when you want to move to using the database, just switch what  entries is set to:

{% set entries = craft.entries.section('service') %}


That way the template will still look exactly the same.