Still do a fair amount of work for retail customers - the net is where many of them 1st contact me. This amount is diminishing over time.
The commercial guys, whether they windup being ongoing, or for one off stuff - 1st contact on the whole is still the phone.
But yeah I dont normally put them on terms on 1st or 2nd orders. If they ask for terms, send em a basic proforma to fill out. Some of them have never actually sent anyone into my shop. Those guys dont need to know its basically a 'mum and dad' operation. Dont think they care, they just want their stuff. Long as they pay on time, happy days.
Anything commercial through the net, would be trying to do as much research as possible before taking any further.
Having a credit card facility, need one for sure. Seems to be no shortage of options there, even in this backwater part of the world I live in. Bought mine outright and just pay a small percentage of the transaction, so naturally I add a bit extra to the price to cover it. In most case see payment through in a couple of days. Being able to process credit cards over the phone is a real bonus.