Welcome TessGeo13!
It would be helpful to know what equipment you have or are willing to purchase, so I'm going to assume you are limited on equipment ....
If you are looking for a complete series, I agree 100% with Kellyro77's recommendation of the LITE series. It's all low impact with the exception of the Calorie Crush bonuses. It's also "lighter" on equipment requirements. You can grow with the weight selections for awhile (going too heavy will really amp up the cardio factor though cuz the pace is too fast for heavy strength training). But it's great for getting your form correct and getting used to Cathe's style. Cathe uses a stability ball in the optional Pyramid Pump workouts in the series, however, if you don't have one, you can always do the exercises on the floor or on a weight or step bench. A stability ball is a great lower-cost option for a bench, plus it's great for a core bonus. The LITE series can sometimes be had for a great price on the Daily Deals.
Another option for a series to start with is the ICE series - an earlier "sister" to the LITE series. It does use a step in part of the Low Impact Sweat and Bootcamp Circuit workouts, but again you can try it without a step if you don't have one. It does have more impact than LITE, however, you can modify it to lower impact. I think it's harder to "grow" with the weight selections in the lifting workouts tho.
And if you're just looking to get your "feet wet" with a few Cathe workouts and don't have much equipment yet:
1) A good "metabolic" workout is the independent Flextrain - it does use sliding devices and depending on your floor, you might be able to substitute a rag or a paper plate, or do it without. It also uses a band and firewalker, but these are relatively inexpensive and good to have. Other good metabolics that don't use much equipment are from the LITE and ICE series, and from the Low Impact Series.
2) Weight workouts that use bands and firewalkers are LITE's Body Weight and Bands, Travel Fit, and there's the Boss Loops and Bands workouts - these use Cathe's fabric bands/loops which are more expensive than the latex bands/loops - but the latex ones could be substituted.
3) There are some great low impact cardio workouts that don't require much equipment - Cardio SuperSets and Afterburn from the Low Impact Series, Ripped with HiIt's Low Impact HiIT, Xtrains' All Out Low Impact Hiit (one segment uses a step and one uses a gliding device - just do without if you don't have), ICE Low Impact Sweat (one segment does use the step and one uses gliding devices (just do without if you don't have them), Perfect 30's Low Impact HiIt. Additionally, most any Kickbox as they don't have heavy equipment demands (some use gloves, but you can substitute 1/2# or 1# handweights, or no weights). Most kickbox have impact (jumping jacks/jump rope moves), however, you can substitute lower impact moves.
There's probably tons more that could be added. HTH. Please ask follow-up questions - Cathletes are sure to respond!
