New to the gym: how often should I workout a targeted area?

Hi.

I am new to the gym, I used to play sports and would do home-workouts, but I am now transitioning to weight lifting. I did a core session 3 days ago, and I am still really sore. For those who have done specific muscle-targeted workouts/days, how often do you target one muscle group per week? Should I wait a week to do another core session? I did legs yesterday, and plan to do arms and back today to give my core a break.

I am also trying to figure out if full-body sessions are better for me versus targeting specific muscle-group. I am a broke student, and can't afford a trainer at the moment, so I'm open to all/any advice. :)

New to the gym: how often should I workout a targeted area?
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