Posted: 16/01/2015 at 16:39
I'm afraid it will depend on the type of orchid. Phalenopsis are the common easy ones and all the advice above suits them. Other types are not so easy and there is loads of advice on giving a rest period, keeping pot-bound - or not - misting regularly - and so on depending on type.
I have an excellent well illustrated book from the Aura Garden Guides series which helps demystify the subject - it was only 2.99 in my local Wyevale or I bet you could pick it up online.
Whilst my phalenopsis have all been growing and flowering well for at least five years, the cymbidium I had just went downhill and eventually died.
I have been given the scented Odontoglossum for Christmas, and picked up another for £4 today in Wyevale - they are more leafy than the phalenopsis and I shall have to read up exactly how to treat them.
I suggest you check the lablel to identify what you've got.