what are the best industry practices for better webpage design?? How to position it In a better Way??

For example I have firstname lastname ....etc..

I am designing it like below

<table style="width: 590px" >

<tr>

<td style="width: 6604px">

&nbsp;First Name *<asp:RequiredFieldValidator ID="reqfname" runat="server" ControlToValidate="txtfname"

ErrorMessage="* Required" Width="71px" Display="Dynamic"></asp:RequiredFieldValidator></td>

<td style="width: 135px">

<asp:TextBox ID="txtfname" runat="server" Width="259px"></asp:TextBox></td>

<td style="width: 3416px">

</td>

</tr>

<tr>

<td style="width: 6604px">

</td>

<td style="width: 135px">

</td> ...