I want to create custom master page and page layout using visual studio. I have already created these in SharePoint 2010 and SharePoint 2013 in farm solution and Sandbox solution in 2010(for office 365).
Now in 2013 sandbox solution are deprecated. Then how to do that? Can we create using app?
One more point to create sandbox solution we need AD, Sql and sharepoint should be installed on different server (3 layer architecture). If we do not have 3 layer architecture and we only have single farm where everything is installed on one server. In that case how to do that?