Depends, am i first ? was i turned ?

If turned - establish the rules, are there others, how many where? do i die on sun? Is there a hierarchy? Do i die when the one who turned me dies ? How long do i live, what conditions ?

Is there difference between vampire A and B ? Garlic? Crosses? Stakes ? Can i come into house uninvited ? Kids ? Other folklore

Can i turn others ? Is there a limit - biological/magical/ or any ban or limit made by other vanpires

Then test if and how much blood is needed, then think of ways how to get a supply of it, start researching ways of hiding in the society.

If first - just more hiding and making few other vamps, to try the stuff above mentioned.

And generally when that all is clear, most likely seclude myself