You can get the manual for free from Singer by starting here: https://www.singer.com/support . Type in the beginning digits/characters of the model number. The current link to the manual is https://www.singer.com/sites/default/files/product_manual/44720e3e888267ef68e078990ec0c5156dfb0fc8_0.pdf .
You'll need to buy the rest of the items. The needles are probably the easiest since those are consumables. You need 2 Singer #2022 needles. The originals were 90/14 needles; 80/11 needles are also available. If you can't find the 2022 needles, get the Singer 2020. The 2020 needles are the common needle for home sewing machines; you'll find them in any sewing machine needle sale display. Here's a link for the 2022 90/14 needles: https://www.sewingpartsonline.com/serger-needles-singer-2022.aspx . I found the replacement spreader here: https://www.sewingpartsonline.com/looper-spreader-singer-550547.aspx . Other parts for the 14SH764 are here: https://www.sewingpartsonline.com/singer-14sh764-sewing-machine-parts.aspx?sort.ss_cat_sort=desc&index=1 . The flat blade screwdriver and the tweezers can be replaced with any that are the same size. Most craft stores with sewing machine supplies will probably have the right size tweezers and the screwdriver. (The screwdriver may be cheaper at a hardware store.)
Answers & Comments
You can get the manual for free from Singer by starting here: https://www.singer.com/support . Type in the beginning digits/characters of the model number. The current link to the manual is https://www.singer.com/sites/default/files/product_manual/44720e3e888267ef68e078990ec0c5156dfb0fc8_0.pdf .
You'll need to buy the rest of the items. The needles are probably the easiest since those are consumables. You need 2 Singer #2022 needles. The originals were 90/14 needles; 80/11 needles are also available. If you can't find the 2022 needles, get the Singer 2020. The 2020 needles are the common needle for home sewing machines; you'll find them in any sewing machine needle sale display. Here's a link for the 2022 90/14 needles: https://www.sewingpartsonline.com/serger-needles-singer-2022.aspx . I found the replacement spreader here: https://www.sewingpartsonline.com/looper-spreader-singer-550547.aspx . Other parts for the 14SH764 are here: https://www.sewingpartsonline.com/singer-14sh764-sewing-machine-parts.aspx?sort.ss_cat_sort=desc&index=1 . The flat blade screwdriver and the tweezers can be replaced with any that are the same size. Most craft stores with sewing machine supplies will probably have the right size tweezers and the screwdriver. (The screwdriver may be cheaper at a hardware store.)
I hope this helps.
Cindy Wells