Here:
http://www.uga.edu/nchfp/publication...n_guide_03.pdf
That's everything you need to know about canning tomatoes. It includes timings etc for both boiling waterbath and pressure canning, for a variety of styles and products (ie, tomato juice, whole tomatoes, crushed tomatoes, salsa, etc). When using a waterbath, you have to add either lemon juice or citric acid powder to the jars to guarantee high enough acidity.
If you've never done a waterbath, you should read basic instructions first, there's lots of guides online. Basically you need a pot that's tall enough, a rack to keep the bottles off the bottom of the pot, bottles and the special lids. It's also helpful to have some tools like jar lifters, maybe you've got some of that stuff already (I've never done pressure canning so I don't know how much overlap there is lol)
I do lots of tomatoes every year, both whole/crushed in their own juice, and salsa. On occasion I've had a jar fail to seal after processing, but that's the worst problem I've had (and we just eat those ones right away heh).
I can't WAIT to be drowning in tomatoes. It's my first year growing my own, and I nearly killed my plants when setting them out... they're doing great now but they're several weeks "behind" due to the time lost in their recuperation... Plus the summer has been crazy wet and cool. I'm getting lots and lots of tomatoes starting now, but it will be quite some time before they're ready to harvest *sigh*