We didn't do much when he was that little, just hanging out with Jasper was enough for him, he just wanted cuddles, talks and feeds and when they're little, they really dont need anything more!
Jasper is now 9 weeks old and we have lots of play time and talking time, it gets so much easier when they're smiling, because you're getting feed back, you know you're doing a good job!
If you want to 'do more' make sure you're giving Patrick a little tummy time often (like, as long as he can handle about 6 times a day) to strengthen his muscles and I just found out that at 6 weeks you start 'side time'... which... yeah... put them on their sides and it makes them use a whole other set of muscles. After a couple of days of doing it with Jasper he can roll from side to side now and LOVES his new trick!
Also, most babies love baths, I dont know if Jasper was a total fan of the whole bath process at 2 weeks, but by 6 weeks he would smile when he was being undressed in anticipation of a bath!
Basically, as long as he's putting on weight and getting lots of sleep and cuddles, you're doing everything he needs at the moment.