Hi Val
It can be minefield and there is a lot of choice. The Biologics booklet that Tracey mentions is really good and will provide a lot of background information about the drugs and their effects.
I have had two anti-tnfs, Infliximab and Enbrel, both were excellent and I did well on each until their efficacy faded. Last year when I had to decide on my next option I was advised against Humira; I understand that it is very similar to Enbrel in the way it responds. If that is the case, Enbrel may not be the one for you. Not all drugs suit everyone and I think the input of the rheumatologist is key to the decision. They know the 'ins and outs' of your disease and should be better placed to know the best option for you. Some drugs may be totally unsuitable!
It's always as well to be armed with the information especially if you have particular wishes i.e you may want to avoid infusions if possible.
Good luck whatever you decide
Lyn x