You can start from the MSP Tutorial 21 examples and adapt them to your Solina software. This tutorial shows you how to use the poly~ object.
About (bowed) string synthesis itself, sorry I have never investigated this. How about a sawtooth / noise balanced oscillator and a bandpass filter :) ? Fortunately there are better solutions, try to type "bowed string synthesis" in google for example.
Maybe you can also find a freeware Solina VSTi that you can load in Max …
There are a couple of useful looking articles at http://www.soundonsound.com
– enter ‘string synthesis’ in the Search box.
They’re actually about building string patches on analogue synths, but this
should translate fairly easily into Max patches; start mono, then get your
head round the poly~ object, as suggested,