Weight training at home help please

If I wanted to be more serious about weight training, could someone recommend a list or site as to what all you would need to start your own home gym? Right now I only have 3, 5, 10, and 20 lbs dumbells. I'm assuming I need a bench with a bar and weights? Any recommendations? I really don't want to go broke doing it either. I'm just not a fan of gyms.

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