Hi and welcome. Good advice above about the book. read, read and read again! Always refer to the books until you are confident with the plan and write everything down.
As for a day off you are better off using a tool called flexisynning. There is a sticky thread on this forum which explains it very well however this shouldn't be used all the time as it will affect your losses. Some people choose to use their syns weekly through the week so they can use less on weekdays and more at the weekend for example, but this doesn't work for everyone.
Good luck and if you are unsure of anything have a search on here and ask if you can't find the answer x