As Steve mentions, map contracts are available in the tn bus kit. (Together with a lot of other great forms).
Well worth the cost.
Re pricing, that is entirely up to your geographical location, area, and what the market in your area will stand.
Rather like having a burger from McDonalds. You can get a Big Mac, from your local store, and it may be $2.99. You go to one in your large town, and it will be $3.99. Head out on the freeway, stop at a service centre, and you will see its $4.99.
It all depends on the locality. Do some research, check out your competitors. See if they have prices on their websites. If not, ring them up. Make a simple spreadsheet, and go from there.
I try to be in the upper 50% for my area.
For the vast majority of my services. (Break fix), I'm more expensive than the big box stores!.
It's all about not exactly what you can get away with, but providing the better experience for your clients.
Ie, as a client would you rather have to send your machine off to X. For them to (in most cases wipe and reload). With no backups, and having to wait 7-10 days, and get charged £50.
Or have it done locally. Your data is backed up. Diagnostics completed thoroughly, reports generated. Treated as a person rather than a number. Have it back within a day or so. And get charged £60.