but on wbtb should i wait a while and just went back to sleep? do nothing?
You can get up, go to the bathroom if needed, maybe drink some water. Just try to stay away from bright lights, and doing anything that makes you too active/awake. It's preferable to daydream or remember your goals, read something lucid-related, etc.

after how many weeks should I expect start having lucids from DILD, from only doing those rc, ada and dream journal?
Like you said, it varies a lot, so noone can really know. Also, DILD is very random lucidity and has to do with luck as well, including how well your mind has adjusted to your routines and how cooperative it is and adaptive to realizing you are dreaming. Perhaps at least one week or two before you start seeing really significant progress and maybe even a lucid! ¯\_(°‿°)_/¯good luck