can I take them out of the pots once they have flowered?
It depends what you want to do with them. If you want them to flower again next year I think the best way is to move the pots to an out of the way place and leave them alone apart from watering in dry spells. You can remove and store the bulbs but you should allow them to die down naturally first. They need to store up energy for next year so don't just cut them down.
If I wish to reuse the pots can I just transfer them into an old pot
Yes you can but give them a good feed in new pot.