SharePoint 2013 Preview System Requirements

Thought it would be good to capture the system requirements for SharePoint 2012 Preview. This is bare minimum hardware requirement.  

Hardware Requirements (Minimum)
Processor	64 bit , 4 cores
RAM	8 GB for Production Use
	4 GB for Developer or Evaluation use
Hard Disk	80 GB free for system drive ( maintain 2x free space as available RAM)
Database Servers
Processor	64 bit , 4 cores for small deployment
	64 bit, 8 cores medium deployment
RAM	8 GB for Small deployments
	16 GB for Medium Deployment
Hard Drive	80 GB for System Drive
	Hard Disk space is dependent on the size of your SharePoint Content
Software Requirements
Database Servers	64 bit SQL Server R2 – Service Pack 1
	64 bit SQL Server 2012 RTM not Release Candidate
Operating System	64 bit of Windows 2008 R2 Service Pack 1 , Windows Server 2012
Web and Application Servers	64 bit Windows 2008 R2 Service Pack  1 , Windows Server 2012
Installation Prerequisites
·         Microsoft .NET Framework 4.5
·         Windows Management Framework 3.0 (CTP2)
·         Application Server Role, Web Server (IIS) Role
·         Microsoft SQL Server 2008 R2 SP1 Native Client
·         Windows Identity Foundation (KB974405)
·         Microsoft Sync Framework Runtime v1.0 SP1 (x64)
·         Windows Server AppFabric
·         Microsoft Identity Extensions
·         Microsoft Information Protection and Control Client
·         Microsoft WCF Data Services 5.0
·         Cumulative Update Package 1 for Microsoft AppFabric 1.1 for Windows Server (KB2671763)

This is just a starting point in terms of understanding hardware, software, database server requirements. Based on the client requirement or business objective capacity planning will help in determining the farm infrastructure. I don’t think no farm size is perfect changes are bound to happen depending upon the requirement but having some roadmap plan will help in a long run.

For more information, please refer to relevant TechNet article

For a basic complete SharePoint install, here are the steps along with screenshots

http://sp-vinod.blogspot.co.uk/2012/07/installing-sharepoint-2013-preview.html