Hope to find some advise as my mind is blowing

Basically, I been going out with this girl back home for a while,
and will get married within next 6 month ...
THE ISSUE / PROBLEM
I recently completed my university and am unemployed ... and of course looking for work that matches the £18.600 requirement. As we all know, it is not easy to get a well/high paid job, nowadays ( I aint complaining but that is a fact ).
Never the less, there is a potential opportunity nearby where I live.
There is a guy running his own business and looking for someone in Office & Car Garage etc.
I do not know how much the payment would be ... but but I am guessing round £400.00 (BEFORE TAX) per week. ??!
Never the less ... my question is:
- Could I potentially start working there (at that business)
- Then apply for a spouse visa after 7 month of work, even without the P60 ??
Is this possible and would this be right under the HomeOffice regulations???
Some say "NOOOOO!! You will have to work for 1 year at a current employer till you get P60 and then make application"
I hope this is not right and that I been misinformed!!
Please advise ..... THANK YOU