Great news 
That was a very good start to the co-parenting that will be your shared role for the next ten years and beyond, and I hope you will both be able to continue to work together for DS's good all through that time.
When you are talking about visitation, don't forget to consider arrangements for school holidays, days like Christmas, Christmas Eve, New Years Eve and Day, Easter, bank holidays, birthdays, mother's day, father's day, grandparent and other relatives' access, trips abroad with either one of you, bringing DS to events like funerals and weddings and anniversary bashes, etc. It is nice to be able to both come together and celebrate DS's birthday as a family -- just a suggestion. Talk to a solicitor about what is usually done, what might be acceptable. Ponder what you would like too and of course, what would be best for DS.
You are also going to have to look at procedures for joint decision making wrt schools, medical treatment, extra curricular activities as well as issues such as transport to and from, etc. Procedures are important to establish, and periodic reviews of arrangements. It's also important to decide on a general approach to topics such as friends, socialising, rules about curfew (if any), pocket money, expenditure on toys, exposure to Xbox games and the like, observance of ratings when it comes to films, to avoid the sort of problems caused by separate sets of rules, or one parent trying to buy the affection of the child.