I think 10 gauge power wire is a bit weak. You may want to go with 8 or even 4 gauge wire, the latter being more than adequate if you want to add onto your system in the future. (assuming you aren't running a monster competition system!).

If you go with 4 gauge wire, you can run it to a distribution block which allows for several branches of 8 gauge wires. The easiest way to go about running the power wire is to remove the glovebox liner. To the right you'll see a rubber grommet with a few wires coming through. You can see the other side of the grommet when you remove the plastic cover behind the battery.