Yes. Unless you specifically tell them where to put the money, outside of a retirement plan at work, they have to default to the most conservative investment. This is to protect you from market loss. If you passively enroll in a retirement plan at work there is something called a QDIA (Qualified Default Investment Alternative) which means that the employer can pick a pre-diversified investment portfolio of an appropriate risk for an employee's age. This is because many people don't know what to pick or don't pick anything at all so rather than have your money sit in a money-market or stable value investment earning nothing, even if you don't pick you investments you stand a fighting chance of earning something. Private IRA accounts at banks don't have QDIA protection so they have to put you in something conservative. The lesson here is to always be an active investor, know what you're invested in and check your balances and earnings at least quarterly. At least you didn't lose money, right?
If your husband's current job has a retirement plan, start there. I'm assuming he doesn't based on need to roll over to a bank but if that's not the case, make sure he is using the plan at work and is contributing at least enough to get any company match. He can roll over his IRA into his new 401(k) if he has one.
IMO, Fidelity has the best 529 plan (and I cringe writing that because they are a competitor of my company). If your state has a 529 plan that includes additional perks like state income tax deductions then go with that but if they don't offer anything extra, go with Fidelity. Their minimum account opening is $50.
BTW I honestly think your bank is screwing with you. According to info I found on the web, the minimum investment for the Lonestar 529 plan is $25 and only $15 if you sign up for automatic contributions.
You'll need to work out how much you can save for each goal - someone like Dave Ramsey or Suze Orman (you can get their books at the library and there is a lot of basic info on line) can help with understanding how much life insurance you need, how much you need to save for retirement, how to pay down any debt and build emergency savings and then after all that, how much you can afford to save for college. College savings is nice to have but last on the list.
Good for you for planning for the long term even on a limited income. Educate yourself and take baby steps and you will reach your goals!