Ad banner with my ads I would like to make a banner that will display ads for my products only. Will it be ok with App Store or my app won't be approved (or cut later)?
The only thing I can find in the App store review guidelines is this:
2.25


Apps that display Apps other than your own for purchase or promotion 
in a manner similar to or confusing with the App Store will be
rejected, unless designed for a specific approved need (e.g. health
management, aviation, accessibility, etc.) or which provide
significant added value for a specific group of customers.


But you can't make it look like the standard i-ad banner because that means you are replicating an existing apple product.
8.3


Apps that appear confusingly similar to an existing Apple product or 
advertising theme will be rejected


And you must keep in mind that the ads can't be too annoying:
2.13


Apps that are primarily marketing materials or advertisements will be
rejected


If you follow these rules I would say go for it, it sounds to me like it is perfectly within apples rules what you are trying to do.

For the full apple app-store review guidelines go here