Hi, Personally I wouldn't learn these two languages at the same time as they are potentially easy to muddle!
However I've been learning Italian for a few years and I have a range of materials - I like the Contatti books and Cds, the BBC website esp at the beginning, also the BBC little grammar book is very good. It depends how you like to learn really - I also have a big book of grammar drills but that's not for everyone! I started with an evening class so that gave me the basics.
This is really nice - both me and my colleagues have used this: http://radiolingua.com/shows/spanish/coffee-break-spanish/
I think this is what I used when I did an evening course - if it's the right one, I then lent it to a friend and he said it really helped him travel around Latin America. http://www.amazon.co.uk/Breakthrough-Spanish-Euro-Book-Pack/dp/1403942625/ref=cm_cr_pr_product_top
I had a really awful book to learn Italian with when I did an evening course but now can't identify it.