I'm want to work on legnth

Hi I’m new in the forum sorry for my english

I really want to work on my legnth so I was thinking to do every second day 10m strech that include 30 sec strech each side and after two week add 5 seconds |
What do you guys think can I gain only from streches or do I have to add also jelqs?

Better you add jelqs.

Is jelq fir length?

Not mainly but it’s an exercise to help work the internal parts of the penis. It will make your length gains easier.