did i mess anything up

my brother just recently bought a 2008 crf 250r. Right now he is away in italy for two months. While he is away he told me i could ride hhis bike if i want to. So the only exp i have with dirt bikes is riding a 50 cc pit bike. I have a 1999 yamaha banshee so im more of a fourwheeler guy. Today was the first day the bike was started. It started right i hop on an go to ride it and i stall it. The i try to start it again and it wouldt start so while it was off i gave it gas 2 or 3 times (no knowing this was bad). After 10 min of trying to start it it finally started. I rode it and went to turn was going really slow in second pulled the clutch in didt give it any gas while clucth was in downshifted to first let the clutch out an the bike stalled. Tried to start it again started then i turned the throtlle to rev it while in neutral and as soon as i turned the throttle it shut off. This happened a few more times and also stalled a few more time while i was riding it. I was nervous because it was my first time on a bike so i was shifting about halfway throught each gear and puling the clutch in slow not giving any gas while clutch was in then shifting and it would stall. The temp was aroun 36 degrees fareinheit. Do you think anything is messed up on it or did i just flood the engine and thats why it was hard to start and am i just riding over cautiosly and staling it because of that. Do these bikes generally not like the cold weather. I would like to keep riding this bike while he is away but i dont want to mess it up so if anyone could tell me if these problems are normal and maybe give sometips on driving it while being cautious so i can learn. The main thing i wanna know is if i messed anything up. This is the first time i started the bike so i hope ididt break it

thanks for the reply but the bike is brandnew bought it saturday.