hi all hofully i got the right board 2nd post for me

im rather new to 40k (i have speent rather long time in whf) and i want to collect a shooty army but dont want it to be one of the main armys like the ones listed on the gameswork shop site . i want somthing totly dif or a off branch to 1 of the main armys thats is really used much. i love converting so thats no issue and i have just started a kroot merc army for my close combat army.
i have never really read much 40k stuff so dont now were to look for random armys.
any info or website would be a great help

thanks peanut