Please help me get my bike started

[jake]

I have a 2005 that's been sitting in my garage for 2 1/2 yrs. Got it to learn on and illness side tracked me. Have no way to get it to the shop so…I got a new battery, drained the gas and carb, put in fresh gas with some seafoam. Got it to start a couple times but only would run about 30 secs tops. Got all safety garbed up to try to get it to move but couldnt get it started again. Would chug chug chug but no fire. Did the spark plug test and saw the spark. Messed with draining the carb bowl thru the screw and some little green stuff came out in the gas. Probably flooded the carb at some point cause gas came out of the overflow. Things only got worse as it wouldn't chug chug chug anymore, wouldn't click when I push the start button and failed the spark plug test. Then I noticed the neutral light wasn't on. Battery dead or very low. What????? Left it alone and the next morning battery had charge but seems to die out after and few clicks of the start button- then back to nothing. What do I do now?? Thought I'd take the battery back to have it tested? Help?!???!