For probably the most half, your pockets software program ought to care for all this. You must solely decide how urgently you want the transaction to be confirmed and decide the feerate, the pockets would care for the remaining. The 88 you point out would probably discuss with a feerate of 88 sats/vbyte right here, though that appears like a gross overestimate on the present market circumstances.
If you wish to manually construct a transaction, you might want to know a bit extra.
Earlier than you construct a bitcoin transaction, you recognize which transaction outputs you’re aiming to create. The recipients addresses inform you how a lot knowledge it’s going to take to specify every output within the transaction. The transaction header can be largely fixed measurement, it is 10 bytes for non-segwit transactions and 42 weight models for segwit transactions.
The enter aspect is a little more sophisticated, as you often have no idea upfront what number of inputs it’s going to take to fund your transaction. Your pockets may additionally have the ability to spend Unspent Transaction Outputs (UTXOs) of varied output varieties which take completely different quantities of knowledge to incorporate in a transaction.
So, you may both want to choose the inputs first, then decide their measurement and calculate the charges, or you are able to do each in live performance, by calculating the fee for every enter and deducting in from the UTXO’s values earlier than contemplating them for inclusion.
The precise sizes for some in style output varieties may be seen on this desk: 
