You register at hoqu.com
for free (if you haven't yet:-)2)
Create an offer and put it to the marketplace
- there are many other offers from different advertisers.3)
Affiliate network then can see this new offer in the marketplace and start to work with the new advertiser. 4)
You don't need to create the offer for each network.
The creation of one version of the offer will be enough, If several networks will want to work with the advertiser.