Only invest what you can afford and don't put all your eggs in one basket.
Are you basing your decision on fundamental and/or technical analysis ... or are you doing this based on a "HINT"? If you know this proprietory info how many other do as well and is it already factored into the market price.
If you are buying stock, is it option elligable so that you can hedge any downside risk for a minimal premium ? Why not go long the calls, control more stock with less investment and make a larger ROI.
Why not just use option strategies long call and put at the same strike? trade off the volitility.
You did say buy, but if you are really planning on shorting the stock, do you have enough margin to cover, are you going to hedge as well or go naked with the options as above.
Of course, the use of options means that they are not only option eligible but that there is a liquid maket for them.
There are a whole lot more questions to ask and just diving in without a broker behind you in the first place is not sound advice.
Asking another board member for advise only means that they will know that info as well. Being connected as most are they will probably act before you do. Since you are not their client the KYC - Know Your Client rule does not come into effect as are other due dillegence rules.
No PMs.
VBB