I'm sorry, but i agree with SirPratt...
If i received a letter from someone with no experience asking if there were any "job's" available, the letter would go into the bin immediately.
If someone can not spell "jobs" what hope do they have of understanding a loadsheet? Whatever your individual opinion, first impressions are vital in any industry, even more so in one like ours where being exact and dotting every i is so, so important.
Good luck Mark, but check every letter you send out very carefully, as it is often sad, pedantic idiots like me who will be the ones getting them.
c