When it comes to sativas they seem to be a little more finicky. They usually like lower nute levels compared to indicas. They also can take longer to finish, some 100% sativas can take longer then 13-14 weeks to finish flowering. I prefer Hazes when it comes to sativas. I love the taste and smell and if you get the right one it is killer smoke. I'd look for something with a little indica influence so it will shorten up the flowing time. I suggest MNS Super Silver Haze, but if you are a first time grower i suggest you start with something easier like skunk #1 of AK-47. Im not sure if either are real sativas but they are recommended for first time growers, they take a lot of abuse and can still produce great smoke with good yields. You could also buy a mix-pack Mr Nice has dreamtime and walkabout which are both mix packs suggested for novice growers and im sure you could find a nice mom in a pack of those. Hope that helps.
. Thanks again for your help