first of all you must have wifi to download tweaks
now, you installed cydia? goto manage>sources>edit>add
now type (in pop up box after *) : cydia.hackulo.us/ and press 'add'. now add another source: cydia.xsellize.com/
now that you have these sources goto search and search whatever tweak you want to, install it and you are done.
sbsettings, cydelete, activator, appsync,barrel,insomnia,installous 5 highlighted once are main. there are many others, just join some forum, get regular updates and install the tweak you want.
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