Don't worry, there are plenty of specialist sewing sites and technical manual sites online that can help you find a manual for a Brother VX1250 sewing machine, or at least point you in the right direction.
Remember the VX1250 shares a manual with Brother's 1140 model, so try searching for a 1140 as well, to double your chances.
Failing that, you could try a dedicated forum for sewing enthusiasts, such as sewusa.com, which offers copies of a range of Brother machine manuals to purchase, or a spare parts dealer such as searspartsdirect.com.
Finally, you could search an auction site such as eBay, and ask Brother VX1250 sellers if they can sell you a copy of the manual, or simply head for Brother's own online support center.
If you're just getting started, then YouTube provides a series of tutorials for Brother machines too: