Yes you need both. Calcium with D3 twice a month and calcium without D3 for every feeding. You also need a multi vitamin that you give twice a month as well.
Same. I make sure i take my cham outside at least once a week for a minimum of about 2-3 hours. I have Calcium with D3 supplementation powder but the only time i ever use it is maybe twice a year when the winter is way too cold for him to be outside (In Maryland that's usually in January and February); i have a Jackons so even in December and March when it's in the 50's/60's i still take him outside for an hour, to get some natural sunlight - and he's perfectly fine/healthy due to it.