Song Mode- Bars etc.

I Understand to build your beat up, you do so using song mode, How many bars make a song? is there a certain amount of bars, u use for intro,verses, hook etc?outro

There are no rules, do whatever works for you. You can actually build an entire song in a sequence if you want. If you work loop based, its easier to just string your loops together in song mode. But really, you decide what your song sounds like. Every song is different, there is no forumula unless you are going for some specific style.