Like redzaku said the first step is to get age verified assuming you are at least 18, from there many options will open up. The second step should be to save your money and get the best gun you can afford, remember the saying "buy once, cry once".
There are many quality pistols in the classifieds for close to the same or less than the price of the marui g17 custom (not that it is bad, there are just better values to be had). There are also quite a number of retailers these days that sell good pistols for very fair prices. Just don't expect any names or links until you are age verified.
Durate et vosmet rebus servate secundis.