I've decided to self-publish my novel!

Yes, I woke up this morning, and in that sleepy quiet time my thoughts turned my novel. I have been writing it over many years and I've had it assessed by Cornerstones, and the Romantic Novelists' Association New Writers' Scheme, I've sent it out to thirty agents and it's come straight back again, I even got my hopes up when Robert Hale asked for the complete manuscript and opened a 125ml bottle of Champagne, but as yet, no success.
I've decided, therefore, that because I've spent a great deal of time on writing and research, (the old cliche is that it's my baby and it's true), I can't let it rot away in the old computer paper box under my desk. I should at least let my family and friends have a chance of reading it. I don't think my dream of being a Sunday Times Best Seller or having a poster on the curved tunnel walls of the Underground will come true with this book, (but maybe the next which I've already started).
So I grabbed some of my writing magazines and sat up in bed with a cup of strawberry and mango tea, and began to do some research.
There are many questions to be answered:
Do I want to do it all myself or buy a package?
Do I want to print enough for my friends and family, or print more to sell?
Am I ready to take on the marketing?
Do I want paper books or ebooks?
How do I get an ISBN number?
How am I going to choose between the providers?
Which self help book should I buy?
Am I doing the right thing?
I'll let you know.