Re: 2007 SV maintenance
Ride it more!
But seriously, I'd change all the fluids (oil, coolant, brake fluid), fork oil too if it was never changed. New battery unless you had it on a trickle charger. Check that the air filter is clean and the air box doesn't have any critters living there. Lube the clutch and throttle cables. Check that the chain is rust free. If it's only surface rust, lube it up and see if it's gone after a longer ride. If not get a new chain. If the tires are older than 5 years, check for dry rot and tears. If you have any doubt get new tires.
If you can, replace the fuel. If not go for a long ride with at least two fill-ups in short order to thoroughly clean your fuel system. Check for any rust inside your tank first.
Then ride some more.