First off, a View may use one or many templates. For example the Profile view uses one main template, and a lot of "sub-templates".
To create a new custom view, follow these steps:
Control Panel Design Page > New Template > Create a Blank Template > Save To: Custom View
Select the type and name it whatever.
This will give you a blank template, you can write your own or just copy and paste in code from somewhere else (including existing templates).
1. Not sure what you mean.
2. Here is some sample code that I have tested as working:
<div style="white-space:nowrap;"><h2>Latest Membersh2>div>
<active:memberslist id="ctlMembersList" OnlineOnly="False" SortColumn="0" SortDirection="DESC" runat="server" PagingEnabled="False" PageSize="12" >
<customtemplate>
[AS:CONTROL:LIST]
[AS:CONTROL:LIST:HEADER][/AS:CONTROL:LIST:HEADER]
[AS:CONTROL:LIST:ITEM]
<div class="aslistrow aslistrowitem">
<table width="100%" cellpadding="0" cellspacing="0" style="border-collapse:collapse;">
<tr>
<td valign="top">
<div style="width:30px;text-align:center;">
<a href="[AS:PROFILE:USERURL]">
<img border="0" src="[AS:HANDLER:PROFILEPIC]?PortalId=[AS:PORTALSETTINGS:PORTALID]&uid=[AS:PROFILE:USERID]&h=24&w=24" title="[AS:PROFILE:DISPLAYNAME]" />
a>
div>
td>
<td valign="top" width="100%">
[AS:DISPLAYTEMPLATE]
<div><a href="[AS:PROFILE:USERURL]">[AS:PROFILE:DISPLAYNAME]a>div>
[/AS:DISPLAYTEMPLATE]
td>
tr>
table>
div>
[/AS:CONTROL:LIST:ITEM]
[AS:CONTROL:LIST:ALTITEM]
<div class="aslistrowalt aslistrowitem">
<table width="100%" cellpadding="0" cellspacing="0" style="border-collapse:collapse;">
<tr>
<td valign="top"><div style="width:30px;text-align:center;"><a href="[AS:PROFILE:USERURL]"><img border="0" src="[AS:HANDLER:PROFILEPIC]?PortalId=[AS:PORTALSETTINGS:PORTALID]&uid=[AS:PROFILE:USERID]&h=24&w=24" title="[AS:PROFILE:DISPLAYNAME]" />a>div>td>
<td valign="top" width="100%">
[AS:DISPLAYTEMPLATE]
<div><a href="[AS:PROFILE:USERURL]">[AS:PROFILE:DISPLAYNAME]a>div>
[/AS:DISPLAYTEMPLATE]
td>
tr>
table>
div>
[/AS:CONTROL:LIST:ALTITEM]
[AS:CONTROL:LIST:FOOTER][/AS:CONTROL:LIST:FOOTER]
[AS:CONTROL:LIST:NORESULTS]No Members Found[/AS:CONTROL:LIST:NORESULTS]
[/AS:CONTROL:LIST]
customtemplate>
active:memberslist>