Is a tow dolly a good way to start?

I have a friend that had a flat bed that I tow with but a lot of times I can't get a hold of him and we loose the deal. My little 6 cycl. truck won't pull the trailer so I was thinking of getting a tow dolly to help fill the void.

Any thoughts?

And is there something special I should know about tow dolly's like is there a certain way you have to tow w/ them or what not to tow?

Thanks!