Please read the information on the terms of payment and delivery. The most convenient and safe option - it is COD (ie, upon receipt in the mail). But you can offer to pay for goods and immediately - before sending the parcel. Transfer money for cosmetics only if you are confident in the reliability of the supplier. Today on the Internet there are many sites, one-day, who deceive people by financial fraud. Therefore, in the administration of such transfer you no one can guarantee a wholly receipt of goods.
Read the terms of delivery. Perhaps the online store does not send mail cosmetics Russia, and delivers only by transport companies (which is unlikely, but occurs). In this case you will have to pay a premium, since sending costs much cheaper. The ideal option would be if all shipping will be free.
Look at the shelf life of cosmetics that you wish to purchase. If on the site this information you do not see, do not hesitate to ask about it at the store manager. Do not buy cosmetics from expiring. Ask that you will be "fresh" items.
Be prepared for the fact that the color of lipstick or gloss, pencil or shadow the reality may be very different from what you see on the photo. Therefore, if you have the time, pre-visit a specialty store cosmetics and products of interest to see "live". Thus, you save yourself from buying unnecessary and inappropriate products to you.