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There are a lot of programs out there to get you fit for BJJ, in my opinion, most people don't need it if they get enough mat time. Its more important to focus on mat time for fitness in jiu jitsu and off the mat physical work should focus on strength and mobility
To learn more about strength training for BJJ read this http://www.bjjstrength.com/bjj-streng...
If you don't believe me, listen to multi World Champion, Bernardo Faria.
The other thing you can focus to really help your fitness, is correct breathing patterns. Nose breathing is the most efficient way to oxygenate the body during the vast majority of your rolling and I've broken down in this free course, exactly how you can train it.