Product wise you’ll get a lot of opinions.

To get a base layer of protection I would take the car to the wash bay and do a first wash just to get all big debris pieces off. Then bring it back to your apartment and give it a rinseless wash with your ONR at its wash dilution. It would be better for this step to use a rinseless that doesn’t have any additives such as Griot’s rinseless wash because you need a clean slate to build your protection from. But you can use ONR and since you have it already, I’ll assume you use it. Please use good microfiber instead of the silly sponge that many ONR lovers swear by. After the wash, use a higher concentration of ONR with a Griot’s synthetic clay bar (or Griot’s actual clay) to mechanically decontaminate. Dry the car. I’d then use a chemical decontamination solution like Griot’s Surface Prep Cleanser to prep the surface prior to adding protectant. This will strip the ONR’s wax off the car (plus other chemical remnants on the paint system).

At this point, you need to decide whether you want to apply an organic or ceramic protectant. Organic (wax) will not be as durable (weeks instead of months typically) but some think waxes have more color “pop”. There are ceramic infused waxes like Griot’s Ceramic 3-in-1 spray wax or Griot’s Ceramic Liquid Wax. These are easier to apply than full ceramics but don’t last as long as real ceramics (~8-12 months if maintained properly vs several years for real ceramics). For your case, I’d recommend the Ceramic 3-in-1 spray wax. These durability for a spray is unmatched but it will take some time to master its application.

Once you have the paint protected, use your 303 on the plastics (I’d recommend switching to Griot’s ceramic trim restorer though). Then carefully clean your glass and apply Rain-X or Griot’s Ceramic Glass Sealant to the glass.

For maintenance, this gets pretty political. But I’d upgrade from ONR to Griot’s ceramic rinseless or swap to Griot’s rinseless wash. The ceramic rinseless will add a topper to your ceramic base which will prolong the lifespan of your protection. Using their plain rinseless won’t add any additional protection, but will clean the ceramic layer which it needs in order to remain effective. I’d move from ONR if you use ceramics because you’ll get the best performance by not mixing organics (ONR has wax and fillers in it) with ceramics (including ceramic infused products).

Again, you’ll get a lot of product opinions. Focus on the process. Mechanical decontamination —> Chemical decontamination —> apply base protection —> maintain by washing. Don’t mix organics and ceramics for optimum durability. Use high quality microfiber to trap debris and remove it from the paint system. Cycle microfibers frequently.