Select top two companies to pursue, research them and estimate their G.M. Royalty will likely fall into the 1/20th to 1/10th of gross margin range. Front loads typically fall into the 20% - 30% of forecasted first year's sales range. Front load can be positioned as advance on royalties or as an option to develop; non-refundable either way.
Plan presentation. Make fully functional prototype and with custom literature, logo, etc.
Contact company - present only to person that can authorize royalty and front load. It is tempting to settle for someone else at larger companies. Don't! Just keep working to figure out a way to get 20 minutes of the key person's time.
Once you've filed a provisional patent, you have one year to get all this done, before you will need to file for Formal Patent.