I'm in the process of assembling raw transactions and I have a couple of questions.
I'm using listunspent to get a list of the transactions I can spend....
First, should I select the oldest transaction first for inclusion? Or is there a better way to select transactions?
Second, for calculating the transaction fee, is there an easy way to estimate the size of a transaction? For example, can I say each output is X bytes and each input is Y bytes?