EVERY SINGLE advice up to this point is gold.
I goofed off way too much during high school to get a scholarship. And I barely squeaked into a four-year university.
Trust me when I say I rode my bike everywhere, took the bus everywhere else, and had to BUST MY ASS in the summers working construction - which also taught me there's often a huge difference between gym-rat strong and real-world strong.
So you're doing the smart thing getting your generals done at a community college. I'm not convinced the quality of education - for the first two undergrad years at least - is that different.
Just like williamk8987 said, a community college should have a gym for students.
If not, ask the local gym if they give student discounts. Once you are able to commute there without breaking the bank, this can help save some coin.
I don't know where you live. But if weather allows, you can buy and fix up a beater bicycle and use it as a daily commuter. Be sure to get a helmet, reflective vest, blinker light for the back and mini head light in the front. And obviously a good lock.
If you live in a big city without bike lanes, however, I don't recommend it - ESPECIALLY late afternoon, when everyone is stressed, tired, distracted and are often stupidly trying to speed home.
Riding in this environment is a skill in and of itself with huge consequences which can happen in the blink of an eye. Little tricks, like looking into the side mirrors to see if the driver has noticed you, learning to read car language (a vehicle that tends to skirt the divider lane on one side is probably going to change lanes towards that side), knowing how to predict behavior based on the make/model (bmw owners tend to be the biggest cunts and subaru owners tend to be the nicest), and on and on and on...
Re: calisthenics, every single advice you got so far is fantastic. I've been preaching the importance of body weight training ever since I joined this forum. This type of training, if properly done, WILL build a solid foundation that you can take into the weight room.
As far as I'm concerned, if you can't do a BARE MINIMUM 15 non-kipping pull ups, 50 push ups, 15 one-arm push ups, you might be strong in your respective event but you're not complete and I seriously doubt you're in optimum health.
Nutrition-wise, you'll again have to get creative. Look up home-made protein bar recipes which, after you pass the learning curve, are surprisingly good. There are plenty of lifters who got big and strong eating ground beef, chicken, eggs, rice, sweet potatoes, vegetables.
No need whatsoever to get the Gucci supplements. Get whatever protein powder and creatine you can find on sale and as long as it doesn't have you running to the toilet, you'll be okay. Food is simply the most anabolic thing you can consume.
Don't forget fermented foods for digestive health. In my line of work, it's not the the money I make - it's the money I keep. In a similar vein, it's not the food you eat, it's the food your body can absorb.
Do NOT UNDERESTIMATE water. NEVER underestimate water.
When grocery shopping, go the market's website and look for what's called 'Loss Leaders.' These are the items the market is discounting to bring in traffic while they bump up prices on other things. Be a savvy shopper.
Ultimately, this purgatory you've found yourself in will teach you to be creative and shove aside whatever stands between you and your goals. Don't be surprised if you look back on all this and are grateful for the experience.