There are so many thing you need to re-check.
First clean out the bobbin area to be sure there aren't any thread tangles still there.
Open the manual and start from the beginning with threading the machine with the presser foot lever UP - always.
Read the instructions and do not rely solely on the pictures as we all sometimes rush to do (I am just as guilty as the next person to do this).
Make sure the bobbin thread is feeding from the bobbin case in the correct direction.
Hold onto the end of the top thread (after needle has been threaded) and lower then raise the needle to catch and bring up the bobbin thread.
Place the fabric under the presser foot and as you hold onto the ends of the top and bobbin thread, hand walk the first stitch, then use the power pedal.
If you need a manual, you can download (free) from Singer -
http://www.singerco.com/accessories/manuals.html
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