welcome aboard shipmate... well the LS isnt quite the land ship Lincoln is notorious for. First thing I would recommend is got to flatratetech.com sign up and post your vin and ask for an oasis lookup. Yhey will be able to tell you if any of the recall or most importanantly pcm updating has been done.
What ls did you get? LS6 auto,auto sst, or manual, or the LS8 auto or auto sst.
Lets make sure your car is in proper condition before you head out in the modding business. LBK_LS is right about Quik LS... he has one well tuned LS. And the sct pcm flash,
www.sctflash.com, renders the best chance for more HP next to cold air induction.
Glad to have you aboard with us. You wont find a more helpful group of folks any where. Always a good time here.
One thing to know is if you car is under 75k miles Lincoln does offer two after warranty adjustments, frrebie fixes, I would advise you to give some strong consideration to picking up an extended warranty. The car is the best driver on the road but it can turn serial killer on the wallet sometimes.
Don't let LBK_LS fool you he is one of the best and I will never claim to know everything. I did invest well in technical resources and tools and I only follow what my resources tell me. Like the tell pilots trust your intruments.