How to Improve your code Quality,Better Programmer

Version Control like svn, or git, ...

automated build a build definition that works without manual steps is really important

UnitTesting to start implementing testing

a incident database to track bugs and requirements

if you have implemented all of the above start thinking about

code metrics like codecoverage of the unittests, qualitymetrics, ...

A continuus integrationsserver like hudson to generate nightly builds and testruns

more automated teststing like loadtests, regtressiontests, ...