Hi. I don't know what your weekly requirement is and what milestone should be set, so please advise if what I've set is not right for you.
On to the topic. I have experience providing just the service you require. I am assuming you will be running some widely available operating system, such as Mac OS X, Linux or Windows. Judging from QuickBooks mentioned, I'm assuming you're a Windows user. That much simpler for me. Right now I manage around 20+ users that occasionally call me in with small problems, both relatives and paid clients. So you can be sure you're in good hands that have plenty of experience with remote administration and user support.
Hope my offer meets your needs and I can be of use.
Thanks for reading this.
Regards,
Alex.