10.1) Trades can be made at anytime between the opening of the trading season and the trading deadline. The trading deadline is Wednesday, November 6, 2015- by 11:59.59pm. CT, which is the Wednesday before the 10th week of the season. This way if a trade is made on that Wednesday, the players who were traded can be in your lineup for the 10th week.
10.2) Almost any kind of trade is possible. Here is a trade that is not possible. A trade of any kind that puts a Franchise over the salary cap or contract years. If any player(s) need to be released to stay under the cap to make a trade legal, the cuts have to be made prior to the trade being accepted.