new used cougar sv pro,now what

[toddzellia]

Ok so this is my first schumachar cougar sv pro its used and iam going to start racing with it this summer.what would be the first thing I should do? Check tranny diff gears
? And what mandatory upgrades should I add? I ordered a hobbywing 120a ESC and10.5 brushless combo and going to get the savox 1258TG servo,what lipo? Stick or saddle and what size? Any help would be greatly appreaicated Cheers