If you want to center a main div, that is a good start. I would suggest that you give it a try. It is going to be unlikely for someone on this forum to produce the structure for you. You are free to start and if you run into issues, post the relevant code and question for assistance.
<style>
#wrapper {
width:1000px;
margin: 0 auto;
}
<div id="wrapper>
<!-- content -->
</div>
JorgeM
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