Wa'alykum Salaam akhi,
I am glad you found it to be beneficial as well. Alhamdulillah.
I know of a website which has bit bigger versions of these chracters and we can use those. One thing for now, in this event you need to use digital banners or hard copy ones (paper ones)?
As of learning it, akhi, I have no problems if you are up for it. It'd be a pleasure. May be you could PM me with what you already know about this or have some idea about. By the way, I used two softwares in making this signature: Paint.net and Animation Shop 3. Out of the two, Paint.net one is free.
I hope you are in the best of health and Imaan, insha'Allah.