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I definitely recommend only doing rollers if you've got a resistance unit.
If you're just starting out and your FTP is around 200 watts or below rollers without resistance will be ok. As soon as you start getting to a FTP of 250+ Watts then you'll struggle with them, unless you like doing your intervals at 110+rpm.
I've used this Ant+ stick on a Mac with Trainerroad without issues
https://www.amazon.co.uk/Anself-Compatible-Garmin-Forerunner-011-02209-00/dp/B00LIIMHP4/ref=sr_1_2?ie=UTF8&qid=1494540518&sr=8-2&keywords=ant%2B%2Bstick&th=1
Sweet. I'll try it out on the rollers then.
Next question, any reason to buy the very expensive Wahoo ant+ dongle for my iPad as recommended by TrainerRoad? I'm not using a smart trainer. This will do the job?
https://www.ebay.co.uk/itm/351888616267