Welcome @marceltrido ,
Glad to have you onboard.
Be prepared for the budget to blow, unless you don't set one .
Ordering from overseas is what almost everyone does, you can still get quality pixel strings from manufacturers in China.
Ready, steady, plan! Think of what parts of the house or props you want first - don't need to have the whole house done in one year.
Decide what controller(s) work best, connect your lights and play around in the sequencer!
Warning: You might get the 'C.L.A.P'! - Christmas Light Addiction Problem.