Chaos is correct, mining is generally best done as a team activity. Having someone haul for you really ups your productivity. However, it gets very dull very quickly, so try and get out into low security space ASAP where the returns are higher for less work, albeit at an increased risk.
There is currently an Eve-wide shortage of the mineral Nocxium, so going after ores that contain this might be more profitable. In 0,5 + space, this can be found in moderate amounts in Pyroxeres rocks. If you go to 0,4 and under, there's plenty in Jaspet and Hemorphite rocks. Get a friend with good refining skills to process the raw ore and then haul the nocxium to a trade hub like Yulai or Luminaire and sell it at a huge mark-up.

If anyone comes close to steal ore have the crusier blast the guy
A word of caution, the way the game mechanics are currently set up mean that if you blast an ore thief in 0,5+ space, the police
will blast you in return.