Apps and songs all have different file sizes. Thus, it is impossible to tell.
Here is something to get a relative idea as to what your needs are: Most songs are usually 5 minutes or under, and have a file size of 10 megabytes or lower. Many songs usually only take 7-9 megabytes of space. Most apps are generally under 10 megabytes, but some are over, and very few are.
It does not take apps.
Lets say you have 150 songs you will be able to hold around 160 apps which is the limit of the ipod touch
My 8g iPod has about twenty apps and 300 songs I think it is almost full.
As many pages as there are. 16 per page.
it depends on how many songs you want.
1750 songs
about 100 or 200
This is dependent purely on how big the hard-drive inside your iPod Touch is.
You can store 144 apps on an Ipod touch.
It depends on the size of the app and whether or not you will also use your iPod touch for music and videos. Apps range from 1MB to 200MB, so if you are ONLY storing apps, then you will be able to hold around 800 apps.
as many apps and stuff you can put on your screen
it depends on how many GB's you have. you see i have an ipod touch with 8GB on it and so i would hold about 8000 songs and games a little more then about 150 apps.