OK resisting the urge to flame here after spotting 5 people in *place* in kelethin on my server.
If ya read the excellent html readme there is an example tradeskill script the does buying and selling. You will need to edit it for arrows of course. If it were me I would get this working for doing 1 type of arrow combine first. Then once that works youd need to somehow check when your combines have gone trivial. Theres a few ways to do this, an event triggered by the Trivial Message is probably the easist to code. Put a flag in the Event sub and check for it before you loop back for another combine.
Once the trivial has been reached you need to change what is being purchased. One way to do this would be have the items to be purchased as variables and then in the event thats triggered by the trivial message youd change the variables to match the new combine youd wish to do. As riz said look at $char(skill,XXX) to see what your current level is then adjust components accordingly.
Of course theres lots of other little things you'll need to do like write the code :-) but if ya up to the challenge you get a nice warm glow when it works
I understand the fletching thing. I raised my fletching using MQ but did the Buying and Selling Manually. I just had to make one of the cool tunare bows and ya cant beat picking off a mob that no bugger else can touch with ya uber bow and uber arrers.
Fippy.