I need to have few sentences checked

Hello there

I have some sentences that I want to check if they are gramatically correct and whether if they convey what I want to say or not. if not true, give me suggestions.

1-check the costs, and compare it to your budget.
2- you have to buy new clothes that suits the weather
3- should think about preparations before the trip.
4- what makes a vacation perfect? And, ...... etc
5- ask him to think of places for vacation and take into account his opinions and suggestions.

I guess you know what I am intending to say.

Thanks in advance