Good for you, agility is a lot of fun. Yes, lots of obedience work is the foundation for agility, especially at that age. Also I would focus more on socialization too, making sure Ripley is exposed to lots of different people and objects and locations.
I wouldn't think about doing any jumping until he's close to a year old. You'll need some decent control off leash, and a fairly reliable recall. Do lots of name recognition and attention exercises. You can teach him some turning maneuvers, like learning left vs. right, all at home. He will also need to be able to do a sit-stay and down-stay when learning the table exercise later. Even though jumping isn't good on a growing dog, you can work on introducing some of the other obstacles. You can purchase a small kiddie play tunnel and he can learn to run through that. Lots of confidence building around different obstacles will help. And he can begin to learn weave poles early on.
The best thing to do is find out some places in the area that have agility classes too. Many obedience training groups also have at least a small intro agility class or include it as something fun and different during obedience classes. Go watch agility classes and find a future instructor that has good techniques you would want to learn from. After you do a few obedience classes, Ripley can start to do agility classes and he can start learning how to do the contact obstacles and such. Then once you've learned a good technique for teaching weave poles, you can work on those a lot at home too. Some of the core equipment can be made/purchased at home pretty cheaply.
Remember that Basenjis are very smart and get bored easily. Especially puppies! Keep your training sessions shorter, and more often, rather than one long time. Don't forget about patience! Also in the meantime there are different books and videos you can purchase to learn about the sport. Search Ebay, Amazon, and the like for some good deals on fun "homework" for you and Ripley.
Good luck and happy learning from the agility hounds here at Kiroja. I'm sure Kim can chime in too with some better advice, she's been doing this a lot more than me!