A simple solution for you if you're new to HTML, is just to use a table to line everything up.
<form>
<table>
<tr>
<td align="right">First Name:</td>
<td align="left"><input type="text" name="first" /></td>
</tr>
<tr>
<td align="right">Last Name:</td>
<td align="left"><input type="text" name="last" /></td>
</tr>
<tr>
<td align="right">Email:</td>
<td align="left"><input type="text" name="email" /></td>
</tr>
</table>
</form>