You can't really pay pro players in SPFL £30 or £40 a week now - those days are gone. Minimum wage has seen to that. You might get £50/£60 for pretty young players. But your older players will be more. Bonuses, signing on fees, etc aren't regarded by players as substitutes for wages - they are extras. How much a week is the basic question when looking to sign a player. Bear in mind that if you had a week where you say had 3 hours training and a long away trip say leaving at 8am and home at 8pm (including time for pre-match meal) then that is another 12 hours = 15 hour week = pay of at least £120 a week (at £8 per hour approx. minimum wage). Danny Denholm in Nutmeg magazine gave a reasonably accurate general overview recently for L2 - two figures are shown the first for a title contender and the second for a bottom of the table side. U20 low earner £75/£50, U20 'star' player £120/£100, 1st team regular defender £250/£200, star midfielder/striker £350/£200, high earner 1st team £250/£150, low earner 1st team squad £150/£100, average 1st team wage £175 to £200/£150.
You also will have richer clubs paying even bigger money for some star players who could be playing at a higher level. Wages in L2 have been pushed up by minimum wage, the Rangers year and the trapdoor/pyramid.