2001 rm250 issues

I just picked up the bike. It starts fine but idles high. I messed with what I thought was the idle adjustment screw and it dies. <-has no effect on idle until turned all the way out then it dies.) Fould the plug. I pulled it cleaned it and put it back in. I think I flooded it as well. Finally started. seemed to run fine. Then after about 5 min it started surging very lightly but it was surging then it started to bog and die.

I did notice when I was draining the gas to check the filter the gas would slow down until I cracked the cap.

Checked the throttle cable and its not making a difference.

Also when I rev it up the idle hangs until I kick it in gear.

I cleaned the hell out of the carb, drained the tank and cleaned the little screen and the vent. I rode it around until it started surging and unscrewed the gas cap and it didnt fix anything.. I am going to check the reeds today. It was running alot better then when I posted this. I will have to take the bike to a shop for the jetting and fine tuning. I dont know what Im doing and I dont want to make it worse or kill the bike. Thanks for the info.