Work out the scope before you ask for prices
Say what is growing, how much land, and what it is for. The trade questions — stump depth, where the material goes, machine access — are there if you know them and skippable if you do not.
Nothing on this site is a recommendation of a specific company. The guidance describes categories of work and the questions worth asking. If you decide to request quotes, the introduction is free to you, contractors may pay to receive it, and you are under no obligation to hire anyone.