API Help

I am trying to use the Zoho Desk API and I have a couple of questions:

1 ) Does the token that I generate by clicking here ( https://accounts.zoho.com/apiauthtoken/create?SCOPE=ZohoSupport/supportapi,ZohoSearch/SearchAPI) expire. if so, how would I generate again the token programatically, I have not been able to do it.

2) I am able to query all contacts or tickets; however, I have not been able to create one using the API calls you provide. Is it because I only have READ scope. if so, how would i get the read/write permission to create tickets, contacts etc.