Hi Welcome to CC
I love Ladycakes site!!
http://www.ladycakes.com/Recipes/Fillings/fillings.htm
That is a GREAT site!
A good one is sponsored by sugarcraft, although it's not quite as user friendly:
http://members.nuvox.net/~zt.proicer/recipes/all-recipes.htm
Here's a list of acronyms to help you understand CC speak:
http://forum.cakecentral.com/cake-decorating-ftopict-2926-.html
HTH
Faux Bavarian/Boston Cream
Note: This is my own personal recipe that I developed. Please credit me if sharing with others. Thanks, Promise Whitley 
1 box (4 serving size) regular (not sugar free) instant vanilla or french vanilla pudding mix
1 cup of whole milk
1 regular tub original (not light or extra creamy) whipped topping
Mix together milk and pudding mix until mix is completely dissolved.
Fold in whipped topping
For a fluffier version, use the larger tub of whipped topping instead of the regular size
To make chocolate, use chocolate pudding mix.
To make double chocolate, use chocolate pudding mix and chocolate whipped topping
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