If you tell us what flavors you have (and what company) we might be able to be more helpful.
Yes, this will help us to help you better.
My experience so far with DIY is limited and so my advice is still green, but I would start by asking if you have read the sticky notes yet in the DIY forum? These are great guides to getting started as far as supplies, safety precautions, tips and tricks, and recipes.
Also check out Hoosier's blog for more detail:
http://www.e-cigarette-forum.com/forum/blogs/hoosier/2264-hoosiers-rules-mixing.html
People have different ideas on mixing, steeping, and flavoring preferences, so you will have to read of those and determine what is right for you. I find that what ClaireW said is true, that until you get to know flavors individually, you can't know how to mix them, nor at what %, nor what they will pair well with in a good recipe. I also started by making 5% mixed without nicotine so as not to waste it and have begun slowly changing the % to see where each flavor shines. I take a lot of notes as I go along, and also copy/paste what I read here onto a document to refer to later.
Another member, HeadInClouds or HIC, has a great blog of recipes and tips that you may also find helpful as you start mixing:
E-Cigarette Forum - HeadInClouds - Blogs
I think the key is having the right flavors to start with, ones you like and provide the taste you are looking for. Try these links for ideas of the best flavors of each manufacturer:
http://www.e-cigarette-forum.com/forum/diy-e-liquid/347885-2012-best-best-diy-flavorings-each-flavor-manufacture.html
There is a great amount of information here, it's just hard to weed
through all the
threads to glean the important details among the various conversations. Several have complied documents for easy reference and can be found in different threads.
Good luck!