How large? Did you reffer to the amount to put in each utxo?
Well in that case it depents of how much are you willing to spend in the future,  for example right now 100 USD are like  ~296000 sats



So if you are going to expend less than 100 USD  you can use utxos less  around that amount, And maybe some 1 or 2 utxos with some x2  or x3 of that amount, just to get some options at the spending time.
All of this is upto you and you are going to receive a lot of mixed opinions, so try to read all of them and form your own opinion