YNAB operates on a conservative approach where you can only allocate funds that you actually have in your hands. What this means is that, if you are operating without a buffer, you need to budget your money as it's received. This can be challenging from a cashflow perspective, especially if you're starting with very little.
What you should do is, every time you receive money, you budget it down to zero. Start with anything you need to pay out before your next paycheque comes in. After that, you need to take care of daily living expenses, rainy day funds, as well as some fun money. As you go, you want to build up category balances for your regular bills so that you're not constantly trying to time bills to paycheques.
Budgeting for the first while is going to be messy, and probably have very little resemblance to what most people think of when they think of a budget. Budgeting in this manner can make it difficult to see the big picture. For myself, I find it helpful to create a spreadsheet with an ideal budget. Start with a typical month[*] -- two of your paycheques, four of dh's. Add up all your monthly expenses. Bills, food, fun money, everything. Include prorated amounts for non-monthly bills, savings goals, estimates for repairs/emergencies, etc. You want your expenses to be lower than your income. The greater the difference, the faster you can break the paycheque-to-paycheque cycle. This spreadsheet isn't the be all / end all of budgeting, but it can serve as a guide while you're budgeting your weekly / bi-weekly paycheques.
There's a lot of people here that are happy to help get a new user started, so don't be afraid to ask all the questions you need.

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[*] Really, there's no such thing as a "typical" month. But what you're building is a guide for future planing; it's not set in stone. Ignoring the occasional three- / five-paycheque month helps ensure that you can recover from set-backs.