Welcome to the forum, Keren!
You might want to check very generally whether there are Israeli online banks that offer brokerage accounts. I would be very surprised if there are none.
Don't get too stuck on Vanguard funds. True, Vanguard is usually the best for Americans but in other countries that might not be true (depending on taxes, financial regulations and so on). For example, it seems not to be true in Germany. But we have other options (not as good but good enough).
What you should look for is funds that:
1.) Invest in broad markets (ideally you want to invest in the whole world)
2.) Have low expenses (terminologies to look for: Expense Ratio, Total Expense Ratio, TER). Vanguard offers as low as 0.05% but you might not find anything quite as low in Israel. For example, my funds have an average TER of 0.24%. I consider that good enough.
3.) You can buy without too many fees. See what Seppia said.
4.) Are tax-efficient. This is a vague statement, but since I know nothing about Israeli taxes, I can not tell you any more, unfortunately. Just as an example, in Germany, holding funds that are domiciled abroad and that do not follow certain reporting guidelines can have very unfavorable tax consequences.