The only reason I ask about paying yourself is if you are planning to pay yourself a salary, you will need to set up PAYE for the company to pay you, always remember the company is a totally separate legal body from you, even if you own 100% of the shares.
As for keeping records, there are many software programs that you can use, I can't recommend any of them as I use something quite obscure.
You do not necessarily need anything flash, an 'in' spreadsheet with columns: Date | Customer | Sale (ie what sold) | Amount
and an 'out' spreadsheet with columns: Date | Code* | Payment to | Description of Purchase/Outgoing | Amount | VAT Amount**
Will suffice to keep you legal.
*Helps to give each purchase a unique reference number / code (Tax office like to see this)
**While you may not be VAT registered immediately, it will help save you a lot of time in the future if you note the amount of VAT involved in each purchase. |