Infinity Clothing

Hey Guys, I am a very new, newbie here and do need some help (by newbie, I literally mean my first Heat Press machine arrived yesterday and I ordered my first Vinyl Cutter today). I have ordered the MH721, now I have read about how it's not amazing etc - please leave the 'upgrade' comments out of this as that is not an option. Since I ordered it and done some research and saw that a lot of people were struggling to connect it to a MacBook. So, here's what I need help with. - What is the best software to cut with on a Macbook with the MH721. I ideally need this to be free, a monthly subscription or very cheap (I have heard about SignBlaze being free?). Again, I don't want any expensive comments.. I am on a very tight budget. I just want a software I can import my designs into and cut. - Are there any complications connecting the MH721 to a macbook? Will I need anything other than the standard lead? It is second hand, it comes with the cutter, power cable, coms cable and installation disk. Hoping someone can help me. Thanks!

Okay, so, I have got a windows desktop now (found an old PC). So now, my next problem is, I now need an adapter for the coms lead to a USB as they are the only ports I have available.