I am a maufacturer of namkeen and my annual turnover is 200000 which scheme should i choose regular or composition. I supply goods  only  in our state

GST Rate was 2% for manufacturers

From 1 jan,it is now 1%

1% OF 200000 is 2000

So ideally you should go for composition scheme as 

less returns to be filed in this case

If you go for normal scheme,your accountant will charge his montlhy fees also which will be expensive for you

To learn how to pay tax refer

https://www.teachoo.com/6633/1949/How-to-Pay-Challan-at-GST-Portal/category/GST-Challan-Format/

To learn how to file return for composition dealer refer

https://www.teachoo.com/7125/2218/How-to-file-GSTR-4-for-composition-dealer/category/GST-Return-for-Composition-Dealer/

 Note

You can also skip registration as your turnover is less than 20 lacs