That's no problem, and it actually will be very cost efficient to get your website mobile friendly from the start rather than making an existing website mobile friendly as an after thought. For a project like this we would sit down with you and talk about the overall website and see if you have any preferences for the mobile material and layout.
We will then go through some suggestions with you and also suggest that for the 'mobile content' we think of your new website visitor in a non wifi location with perhaps just 3G or less in terms of mobile phone data bandwidth.
The mobile website cannot load slowly for them and you have to think of what material is of actual interest to a smart phone user versus a PC user. In a lot of cases there is overlap between the mobile and PC content but the mobile content will sometimes be shorter and more mobile focused.
