How to make an infinite level, infinite tiles and randomly generating actors?

First of all, sorry for the long title. I just wanted people to know what exactly they are helping me with so they won't waste their time.

Anyway, I'm making an iPhone 5 game, it's a climbing game and just like any mobile climbing game, it's gonna have an "Infinite Mode" after you complete the game. What I want is for the scene to be infinite, now I remember alot of people saying that I can make the illusion of the scene being infinite, but I completely forgot how to do it as I haven't been on here for over 2 months. I also want to know how to make the tiles seem infinite as well.

I also heard some people on here telling me how to make randomly generating actors as you go through the level... unfortunately I forgot that as well.

So if you guys could tell me how to do all of those things, that would be absolutely wonderful.

Thanks in advance!

You can use "warping" for the infinite scene.
There's an amazing tutorial in the featured section of StencylForge by Tuo (Demo- Infinite Space Shooter. Level 6)

Thank you .

Once I have all the textures, pictures, sprites etc., I will play around with the Stencyl events to see if I can figure out how I can get the tiles to also sort of "warp".

Thanks again and if anyone has any ideas how to do the other things, it's greatly appreciated.

P.S. I'll let everyone know whether I found out how to do them.