Most vocal processing chains have three things: EQ Compression Reverb And generally in that order, although not always.  The EQ will help the vocals sit in the mix by removing any unnecessary frequencies, and boosting those you want to shine through.  Compression is next, in order to trim any transients and perhaps boost the overall sound with some makeup gain.  After that, you can apply some reverb, but as a rule of thumb always use way less than you think. Reverb gives the illusion of space and distance, and too much will push your vocals back in the mix. Same as your compression, dial in your reverb until it’s audible, and then dial it back. This way you can ensure a more natural-sounding result.  If your vocals are double-tracked and also have additional backing vocals it might be best to group all your vocals on a bus channel so that your vocal processing chain is applied evenly across all tracks.  This will save you lots of processing power and you won’t need to duplicate all these effects across individual channels.  After you’ve applied your basic chain of EQ, compression, and reverb you can experiment and try some slapback delay or even chorus and see how it sounds.