Congratulations - and good luck.
I did that about 5 years ago and we're doing well.
Owning a company is not like being employed. You have a number of ways of taking money out of the company .
You can take that as being a compensation for your time, or as a reward for having the insight to set up a successful venture.
The first way is to pay yourself a salary. That could mean employing an accountant or book keeper to do the payroll stuff (We pay an accountant). They will handle things like weekly or monthly salary payments from the company to your personal account as well as NI, pension contributions and so on.
The second way is to for the company to declare a dividend, that goes to the main shareholder (you).
Once the company is making good money, you can balance these two for maximum tax efficiency.
The recommended route for tax-efficiency is to take a minimum salary (around GBP11k/year), which should be under either the NI threshhold, or the tax threshhold, depending on your personal circumstances, and the rest to be paid as a dividend.
As a personal taxpayer, you can take the first GBP5k tax-free and the rest is taxed at 7.5%. Remember, however, that the company also pays corporation tax on any declared dividends, so it works out cheaper, but not much, than paying yourself a salary.
In the first year, the company can trade at a loss. The company can declare a dividend, but as the main shareholder, you can choose to leave that on account within the company, using a directors' account, where either the company owes you money, or the other way around.
A company is only insolvent if the creditors (that may well be you), demands everything they are owed, and the company cannot afford to pay. If you as an individual, allow the company to operate at a loss for a year or two, using your own money to fund the deficit, then it is trading at a loss, but it is not insolvent.
Hope it helps - and good luck with the ride It's hard work, but very rewarding :)