I have a few questions.

1. Can I stream on mobile ? (iOS)
2. Is it compulsory to have a timer ?
3. ^ If it’s compulsory can I get timer on mobile?

yes i believe depends on the game yes

You can stream anything on mobile. If you have twitch or YouTube then I know for sure it’s fine.

Yes you can stream on mobile, for IOS I think that the best option is mobcrush. Timers on iOS games arent mandatory so dont worry

1. Yes (the easiest way to do so tends to be using the AppleTV thing to connect to software on your PC), although only recording runs is required, which iOS has built in features for.
2. Only for very specific games, although having one would be nice for both you and the mods.
3. iOS might have one, but it'd be hard to set up, you'd probably just have to edit it into the video. One solution could be playing a video of a timer in picture-in-picture mode and having that up as you play, but that'd be annoying for you depending on the game.