The Alfresco supplied Installers will install all you need to run Alfresco on your machine; which includes JDK, Tomcat, SOLR, Share, Google Docs integration, LibreOffice, Sharepoint module etc.
Note: JVM memory now defaults to half system memory, minimum of 2GB.
Note: latest OS patches are always recommended.
Solr 4 will be required going forward to use all new features in Share Search screen - Lucene sub-system is deprecated and if selected as the Search sub-system via a manual WAR file install route, will cause a lot of search related screens and pickers to produce no results.
Some of the files that used to be available for edit in the alfresco.war (such as repository.properties) are now inside JAR files (due to the structure of the maven build) - so may not be as obvious as they were in 4.2 for editing. They can be overridden in the usual way, or extracted if you prefer.