suspension parts help???

EX350

New kid on the block. Also new to modifying and need some knowledge from you guys.

In the process of buying a new set of aftermarket 20" wheels. I also want to drop it about 1" - 1.25" all around. I'm looking into buying a set of BR coil overs, but I would also like to know if control arms, toe links, etc. are necessary for the drop that I would like. They don't have to be necessary for me to purchase. If someone told me I should to get the best drop without messing up the suspension, then I would also make a better and piece of mind purchase, without thinking I overspent. I've spent a good amount of time web searching for answers, but there seems to be endless parts and vague answers.

Also, if someone could tell me exactly what I should purchase, that would be great, too!

Any input or information would be greatly appreciated.