I taught myself French mainly with Duolingo, but I also found Easy French Step-by-Step helpful. Also, Fluent in 3 Months has lots of great tips for general language learning.

If you practice daily, becoming conversational in French by summer end is perfectly doable. What I did is, learn a few new words on weekdays (around 5-10), and then review them all on weekends. Focus on the more common words and phrases, basically what you'd need to know if you were going on a short trip to France. Listen to radio/music too, so your brain gets used to the language.

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Good luck on your endeavor!