2010 triumph thunderbird. Do i check oil level with bike level or leaned over on kickstand. I bought this bike used and no owners manual came with bike. Where can i get one?

You should check the oil level on a level ground and it should be standing. If your triumph motor has a center stand, better use that then check the oil level. If you change oil, you also need to change the oil filter. For the manual, go to http://www.triumphmotorcycles.com/

Hope this helps