Need help getting started with private proxies

I've had SB for a few months now, but haven't really done all that much with it yet. I don't have any private proxies and wanted to get started looking into them. How many would I need? I'm running SB on my local machine for now, because I don't have a VPS or anything like that. Would 5 or 10 be sufficient to get started out?

It depends on the lists you blast. 10 is typically enough for single user running one instance.

You need to post more about the kind of stuff you are trying to use Scrapebox for. If you are just starting out even a few proxies will be sufficient in increasing your success rates. If you are doing something like trying to post onto the same site and get around their spam systems you'll need more.