As for fittings, since you plan on doing all new soft lines (no hard lines) your fitting needs are determined by your control valve and you hydraulic cylinders.
I suggest you pull one cylinder, you decide if one is easier than the others. Buy a fitting to fit this cylinder as you take it to a shop with you. Ideally this fitting fits all of your cylinders on both ends. If so you have 1 answer to your fitting needs. Take lots of pictures, make drawings and decide the route your hoses will take. Take careful measurements of these routes allowing space for movements as the cylinders pivot during extension and contraction during their usage.
Note: you will need to split lines for every route that cylinders work in conjunction (2 to 4 lines). Be sure to use fittings rated for the pressures that will be in use on the hydraulics!
The other area for fittings on the loader will be at the control valve. Take it with you when you are ready to order the hoses. There are likely to be 2 sizes of fittings (could be more but 2 is common). 1 size is your supply and return lines, which you need to decide how they will run and connect to your tractor. The other size is those going to your cylinders likely 4 ports ( 2 for loader lift and 2 for bucket functions). While you may have 8 ports on your cylinders (if 2 cylinders for bucket) note above I stated the hoses need to split to go to both cylinders.
