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Don't be so hard on your self electronics is a fun hobby but it does take time to learn.

You can determine the time delay by measuring the relay coil resistanceThe time will be approximately 2.5 C R. (For the record the formula for a time constant is t = C * R and it takes 5 time constants to complete) I use 2.5 because of the relay coils pick up aand drop out voltages.

If you
measure 400 ohms and you want 5 seconds then

5 = C * 400 or C = 5 / 400 so

C = 0.0125 F or 12,500 uF

I would go with the LM555 timer IC also! ;)

If I can help with any of your electronics questions just let me know.