mate im only a amateur too, but ive had plenty of advice...
get a hydrometer!!! that is number 1, your homebrew shop will have them, they aren't expensive. what ive found is wait 5 days, pour a sample into the test tube, if it sinks into the yellow you are done, if not, let it go another 2 days and try again. If it aint in the yellow area of the hydrometer it aint ready to drink.
If none exploded while carbonating, than I think you didn't have everything sterile, that's the main ingredient STERILILITY!!
did you open the fermenter during fermentation? did you sterilize?
hope this helps, but trust me get a hydrometer tomorrow, so you will know when your current brew is cooked!!
One other thing, buy a keg setup, you don't have to wait to drink it!
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