VS 2012 Renaming all files inside all folders in a Selected folder

Hey so as the name suggests i am VERY new to all things to do with code and such but have decided to learn and thought of a small program id like to make that would also be of some use to some things that i wanna do and take forever.

so what i want to do is rename all my image files in my manga folders of which there are up to 800 folders and in each folder there are up to 100 images i want to rename all these files in order and then place them into 1 folder so they can be read in order without changing files.

i have done his manually for 1 of them and takes FOREVER, i did this by:
Making a new file named the manga name then all EG Toriko All
then go into file 1
Ctrl A (select all)
F2 (rename)
1
Enter
there by renaming all files 1(1) , 1(2), 1(3), 1(4) and so on
then copy those and paste into new file (Toriko All) and move to next file naming it 2 and so on till they all done.

so to make something fun as well as useful id like to write a little program to do this for me for a selected file.

The form i thought of was simply 2 browser boxes and a rename button.
browser one is the folder with all the files in it and browser 2 is the output file.

now i have tried to find this type of help already in the forums but all the renaming ones aren't quite what i needed

if there is one that is the same and this is a duplicate then im sorry but some pointers in the right direction would be nice.

thanx for all you help in advance